Used horizontal band saws - half-automatic - cutting range 301-349mm for sale (62)

Condition: ready for operation (used), Year of construction: 2012, BANDSAW TEBA 310 -CE marking -Year of manufacture 2012 -Maximum cutting capacity 310 mm -Conventional / Semi-automatic -Miter cutting device -Coolant system -Cutting speed / Infinitely adjustable -Total power 3 kW -Saw blade dimensions 3990x27x0.9 mm Ledpfx Akez Di Sleleag -Approx. 20 spare saw blades Dimensions: L x W x H 1.7 x 1.2 x 1.9 meters / Weight approx. 1100 kg Errors and omissions excepted.

Condition: good (used), Year of construction: 2001, Semi-automatic Bomar STG 330 DGH saw - Cutting dimensions: 330mm x 510mm - 60-degree mitre cut Lasdpfxozur Duo Aklog - Variable cutting speed - Year of manufacture: 2001

Condition: like new (used), Year of construction: 2022, functionality: fully functional, For sale is a high-quality BOMAR Proline 420.350 H. This machine impresses with its robust two-column design, high cutting accuracy, and ease of operation. It is ideally suited for professional use in the steel trade, metalworking, mechanical engineering, and industrial manufacturing. Thanks to the stable guidance of the saw arm and the steplessly adjustable band speed, the machine enables economical and precise cuts, even with demanding materials. The Proline series is considered a reliable industrial machine with a long service life. Technical data: Manufacturer: BOMAR Model: Proline 420.350 H Type: Semi-automatic Design: Two-column band saw Cutting angle: 90° Max. round material: Ø 350 mm Max. rectangular material: 420 × 350 mm Saw band dimensions: 4,780 × 34 × 1.1 mm Band speed: steplessly adjustable 20–120 m/min Drive power: 3 kW Power supply: 400 V / 50 Hz Material support height: 780 mm Machine weight: approx. 800 kg Machine dimensions (L × W × H): approx. 2,325 × 1,197 × 1,997 mm Equipment: Robust two-column guide Steplessly adjustable cutting speed via frequency converter Hydraulic saw feed Automatic cutting pressure control Split full-stroke clamping device Carbide saw band guide Coolant system Chip brush Industrial design for continuous operation Condition: Used Technically functional Ready for immediate use Inspection under power is possible by appointment. Scope of delivery: Band saw BOMAR Proline 420.350 H 4m roller conveyor on the feed side 4m roller conveyor on the discharge side Ljdpfx Akezlz N Ioljag Manual measuring stop Operating manual (digital) Accessories as per inspection Inspection / Shipping An inspection of the machine is highly recommended. Loading can be supported upon agreement. Transport can be arranged upon request. Errors, changes, and prior sale reserved.

Condition: good (used), Year of construction: 2009, machine/vehicle number: 60227, Offer 26293 Hydraulic Horizontal – Two-Column Miter Bandsaw Machine Technical data: - Automatic operation for the cutting process, hydraulic lifting and lowering of the saw frame - Manual miter adjustment to the left and right with clamping - Saw band dimensions 4400 x 34 x 1.1 mm - Cutting speed, continuously adjustable 15 - 150 m/min - Cutting pressure regulation, continuously adjustable 10 - 15 bar - Lowering speed 0 - 300 m/min - Cutting range: - at 90°: round 335 mm - at 90°: square/rectangular 500 x 335 mm - at 45°: round 330 mm - at 45°: square 320 x 335 mm Lsdpfx Aszz Rblskleag - at 30°: square 170 x 335 mm - Miter adjustment with digital angle display - Outfeed roller conveyor with dimension stop 6000 mm - Infeed roller conveyor 4000 mm - Drive 400 V / 6.5 kW - Space requirement approx. W 1500 x H 1850 x D 2100 mm - Weight approx. 1500 kg

Condition: used, Year of construction: 2014, cutting diameter 305 mm saw band length 3370 mm cutting width 350 mm dimensions of saw-band 3370 x 27 x 0,9 mm 305 mm 260 mm 350 x 200 mm 250 mm 230 mm 230 x 200 mm 175 mm 155 mm 170 x 100 mm total power requirement 1,5 / 1,8 kW weight of the machine ca. 600 kg Lajdpfxezu A R Eo Akljg dimensions of the machine ca. 1700 x 1500 x 1950 mm Features: - Semi-automatic operation via automatic saw frame lowering - Miters: left 60°, right 45° - 2 speeds: 40 and 80 m/min - Solid material support table - Operatorâ??s manual

Condition: new, Year of construction: 2026, functionality: fully functional, Cutting capacity 90° (rectangular) 460 x 250 mm Cutting capacity 90° (round) 330 mm Cutting capacity 60° (rectangular) 205 x 200 mm Cutting capacity 60° (round) 205 mm Ledpfx Akjz Drarjleag Cutting capacity 45° (rectangular) 305 x 250 mm Cutting capacity 45° (round) 305 mm Adjustable band speed 48/96 m/min (60 Hz) Saw band dimensions 27 x 0.9 x 3960 mm Power consumption 1.5 / 2.2 kW Machine weight 900 / 1060 kg (net/gross) Machine dimensions LxWxH = 2310 x 1070 x 1630 mm

Condition: like new (used), DEMONSTRATION MACHINE Lsdpfozzzitex Aklsag ELMAG band saw including 2 bi-metal saw blades & 5 liters of coolant Like-new DEMONSTRATION MACHINE with minimal operating time! For sale is a high-quality band saw in very well-maintained, like-new condition. Included in the scope of delivery: 1x Bi-metal saw blade – NEW 1x Bi-metal saw blade – already installed 1x ELMAG coolant concentrate, 5 liters Machine as a DEMONSTRATION MACHINE with minimal operating time Ideal for workshops, metal construction, locksmiths, assembly companies, and demanding DIY enthusiasts. Technical data: Cutting range for round tubes at 0°: max. 180 mm Cutting range for round tubes at 45° right-hand miter: max. 110 mm Cutting range for square tubes at 0°: max. 180 mm Cutting range for square tubes at 45° right-hand miter: max. 110 mm Cutting range for rectangular tubes at 0°: max. 305 × 180 mm Cutting range for rectangular tubes at 45° right-hand miter: max. 180 × 110 mm Saw blade length: 2,360 mm Saw blade height: 20 mm Saw blade thickness: 0.9 mm Cutting angle: 0–45° Speed stages: 4 Cutting speed: 18 / 28 / 37 / 54 m/min Saw blade drive: 750 W Coolant pump: 100 W Mains connection: 400 V / 50–60 Hz Sound pressure level steel: 71 / 73 dB(A) Infeed height: 530 mm Dimensions (L × W × H): 1,250 × 430 × 1,000 mm Weight: approx. 130 kg The machine is located in A-5431 Kuchl and can be inspected and assessed at any time during our opening hours. Subject to prior sale! Related terms / search terms: Band saw, metal band saw, metal band saw machine, band saw metal, sawing machine, metalworking, miter band saw, miter saw, band saw 400 V, industrial band saw, workshop machine, metal construction, steel band saw, sawing machine, metal band saw 2300 mm, ELMAG, ELMAG band saw, bi-metal saw blade, coolant, workshop equipment, locksmith, mechanical engineering Reference: R-A0117

Condition: excellent (used), KASTOmicut U 2.6 – Semi-Automatic Pivot Frame Bandsaw incl. Long Roller Conveyor For sale is a heavy-duty, semi-automatic pivot frame bandsaw KASTOmicut U 2.6. The machine features infinitely variable cutting speed and is ideally suited for all cross-cutting and mitre tasks (-45°/+60°) on pipes, profiles, and solid materials in workshop environments. The fully hydraulic saw feed and hydraulic material clamping enable semi-automatic, sensitive, and tool-preserving sawing operations. — Features • Hydraulic saw feed • Rotary table as material support • Hydraulic material clamping • Infinitely variable cutting speed • Mitre cuts to both sides from +60° to -45° — Technical data • Dimensions (L × W × H): 760 × 1620 × 2040 mm • Material support height: 950 mm • Total weight: 510 kg • Total power: 2 kW • Cutting speed: 20 – 110 m/min • Saw band dimensions: 3,180 × 27 × 0.9 mm • Saw band guides: Side and back roller guides, replaceable • Material clamping: Mechanical • Saw feed: Hydraulic, continuously adjustable • Saw band tension: Mechanical • Saw band cleaning: Fitted with a replaceable wire brush — Cutting capacities • 90° round (solid/pipe): 160 / 260 mm • 90° flat (W × H) (pipe): 310 × 260 mm • 90° square (solid/pipe): 160 × 160 / 260 × 260 mm • +45° round (pipe): 220 mm • +45° flat (W × H) (pipe): 200 × 200 mm • +60° round (pipe): 140 mm • +60° flat (W × H) (pipe): 140 × 140 mm • -45° round (pipe): 240 mm • -45° flat (W × H) (pipe): 200 × 260 mm • -45° square (pipe): 210 × 210 mm • Minimum remnant length: 30 mm — Condition & Delivery The machine is in perfect working condition and ready for immediate use. • Shipping on a pallet by freight forwarder possible Europe-wide • Additional machines available – check our listings for more offers — Contact Maschinenhandel Nord Gerstenstraße 2 17034 Neubrandenburg 📞 All prices plus VAT. Subject to change and errors excepted. Laedpfx Akexizabjljg

Condition: excellent (used), Year of construction: 2021, functionality: fully functional, German band saw MEBA Ratio 300 -Semi-automatic -two-column -cutting diameter 300mm -max dimension 300x500 -floating speed control (inverter) -4800x34x1.1 belt -cooling systems Laodpfx Akeug Hpzsljg -fast vise clamping -belt cleaning -feed auxiliary roller -feeding table (not in the picture) -German WIKUS cutting belts new 10 pcs (value about 3000 zł) -CE -net price -possible delivery to any place in the country Machine very little used like new from 2021 in perfect technical condition . SPECIALIZATION ( since 1987 on the market! ) METAL saws & Largest selection in the country I have other band saws for metal of all types and bring on individual orders professional equipment from 200mm>1000mm diameter cutting material Automatic / Semi-automatic / Manual NO ! is a "Chinese" like many offered here branded professional machines !!! ONLY PROFII MACHINES !!! BE SURE TO SEE MY OTHER AUCTIONS !!! I SELECT MACHINES W/ INDIVIDUAL NEEDS ! YOU NEED A GOOD MACHINE AT A GOOD PRICE CALL

Condition: new, neu ca. 4 Monate ab Auftragse Türkei 21700 € 416.64 € Doppelsäulenführung Laedpjz Afcgsfx Aklsg 4900 x 3,4 x 1,1 mm 15 - 120 m/min 325 mm 320 mm 400 x 320 mm rund 280 mm, rechteck 240 rund 180 mm, rechteck 180 650 mm 0.55 kW 3 kW 0.12 kW 2425 mm 1050 mm 1600 mm 1250 kg Linear guides Sensitive cutting pressure control Bi-metal saw blade (34 mm) Coolant system Thermal overload protection Hydraulic-mechanical blade tensioning Saw blade brush Hydraulic clamping of the vise Optical height adjustment Heavy-duty gearbox Band inclined at 2° Infinitely variable cutting speed Digital display for miter angle Hydraulic locking of the miter adjustment

Condition: used, KASTO PKS130 horizontal semi-automatic bandsaw. Lajdpfx Aey E Nkieklog

Condition: good (used), Year of construction: 2007, machine/vehicle number: 22428.07, Offer 22252 Technical Data: - Cutting range at 90° round + square: 330 mm - flat: 600 x 320 mm - Mitre adjustable left / right: 30 / 45° - Cutting range at 45° right + left round: 320 mm flat: 350 x 320 mm - Material support height: approx. 920 mm - Saw band dimensions: 4440 x 34 x 1.1 mm - Cutting speed steplessly adjustable: 10 to 100 m/min - Hydraulic lifting – lowering of the saw frame - Upper lift limitation of the saw frame - Cutting pressure steplessly adjustable: 0 - 10 m/min Ljdpfx Aown Dy Dskleag - Hydraulic material clamping vice - Cooling device - Total drive power: 400 V / 2.2 kW - Required space: approx. W 1400 x H 1400 x D 2400 mm - Weight: approx. 1000 kg

Condition: good (used), Year of construction: 2019, functionality: fully functional, Metal band saw EM BS 350 DGHF with base frame Lsdpfx Akswxad Tolsag

Condition: new, Year of construction: 2026, Metal Cutting Band Saw CORMAK BS530H – Professional Tool for Cutting Pipes and Profiles The CORMAK BS530H metal cutting band saw is a high-performance semi-automatic band saw designed for precise cutting of steel components, pipes, and profiles at various angles. Its robust cast iron construction, reinforced blade guiding system, and advanced hydraulic technology make it an ideal solution for serial production and demanding industrial environments. The integrated control panel allows a single operator to manage all machine functions, significantly reducing operating time and improving work ergonomics. Main advantages of the machine Semi-automatic operation – hydraulic lifting and lowering of the saw arm and vice control via the control panel. Worm gear transmission with bronze components – ensures smooth, precise operation without vibrations. Stepless cutting speed adjustment from 20–70 m/min – allows adaptation to various materials and cutting conditions. Carbide blade guides with roller bearings – provide durability and highly accurate blade tracking. Quick-clamping vice – manually or hydraulically operated, with left/right positioning capability. Angular cutting from -45° to +60° – with precise angle reading on the scale. Durable cast iron body – guarantees cutting stability and long machine service life. Hydraulic arm lowering adjustment – allows precise control and setting of the return height. Construction and technology The BS530H model features a reinforced drive system and industrial hydraulic components, ensuring reliable operation even under intensive working conditions. The heavy-duty cast iron body reduces vibrations and provides smooth, consistent performance. The ergonomic control console allows all operations to be managed from a single location. The coolant system integrated into the machine base effectively removes heat and contaminants, protecting the blade from overheating and premature wear. Precision and work efficiency Thanks to stepless speed adjustment, manual or semi-automatic operating modes, and the use of a dial tension gauge for monitoring blade tension, the BS530H metal cutting band saw ensures repeatable results and high cutting quality even during long production runs. Work efficiency is further improved by the front material support roller and the arm locking system, which increases operator safety after completion of the cutting cycle. Applications The machine is designed for: industrial production plants, metalworking workshops, companies performing serial cutting of profiles, pipes, and solid steel sections. It is ideal for serial production, steel fabrication, and preparing components for welding or further processing. Standard equipment Control console with semi-automatic functions Hydraulic vice Powered blade cleaning brush Coolant system with pump Front material support roller Dial blade tension gauge CE declaration and technical documentation (DTR) Lasdsw U Svlopfx Akljg Optional equipment Additional material guide rollers Semi-Automatic Metal Cutting Band Saw CORMAK BS530H Technical data Parameter Value Working height 965 mm Cutting speed 30–80 m/min Saw blade dimensions 3770 × 34 × 1.1 mm Coolant system power 0.1 kW Total motor power 3.0 kW Power supply 400 V Machine dimensions (W × D × H) 2200 × 1400 × 2050 mm Weight 730 kg

Condition: used, Year of construction: 2009, functionality: fully functional, For sale is a used, fully functional semi-automatic miter band saw. 0° 330 mm 320 mm 450 x 320 mm Ledpfx Ajwigavekljag + 45° 320 mm 300 mm 300 x 300 mm + 60° 210 mm 200 mm 200 x 200 mm - 45° 320 mm 300 mm 300 x 300 mm - 60° 210 mm 200 mm 200 x 200 mm Max. vise opening 455 mm Blade size 4500 x 34 x 1.1 mm Saw blade motor power 4.0 kW - three-phase Blade speed 15 - 100 m/min Accessories: 4.5 m roller conveyor, various saw blades

Condition: good (used), Year of construction: 1999, machine/vehicle number: 6410/102/051, Offer 25325 Technical Data: - Cutting capacity at 90° Laodpjxph E Rsfx Aklog - round: 320 mm - flat: Width 500 x Height 300 mm - Mitre adjustment – right & left up to 60° - Cutting capacity at 45° – left & right: 320 mm - flat: 304 x 300 mm - Material support height approx. 750 mm - Saw blade dimensions: 5090 x 34 x 1.1 mm - Cutting speed infinitely adjustable: 17 to 90 m/min - Cutting pressure infinitely adjustable: 0 – 10 m/min - Total drive power: 400 V / 4.0 kW - Motorised chip removal brush - Hydraulic lifting/lowering of the saw frame - Hydraulically operated movable workpiece vice - Hydraulic mitre adjustment with digital angle display - Swarf conveyor - Motorised infeed roller conveyor KASTO, 10 m - Outfeed roller conveyor KASTO with length stop, 6 m - Required space approx.: W 1300 x H 1400 x D 3100 mm - Machine weight approx.: 1800 kg - Roller conveyor weight approx.: 3500 kg

Condition: used, Year of construction: 2004, High-capacity band saw with roller feed MG model BMSO 320L Used semi-automatic band saw - High-capacity band saw with roller feed - Progressive hydraulic feed Ljdpsx Ng Sxjfx Akljag - Chip cleaning brush - Saw speed adjustable via electronic frequency inverter from 20 to 100 m/min - Front millimeter stop of 500mm with electric limit switch Serial number: 41021 - Blade dimensions: 4160x27x0.9mm - Motor: 1.5kW - Round cutting capacity at 90°: 320mm - Rectangular cutting capacity at 90°: 500x320mm - Square cutting capacity at 90°: 320mm

Condition: new, Year of construction: 2026, CORMAK BS370H Semi-Automatic Metal Band Saw The CORMAK BS370H is a robust semi-automatic band saw designed for precise cutting of tubes, profiles, and solid materials. The latest version is equipped with an upper clamping system for bundle cutting and variable blade speed control via an inverter, adjustable from 20 to 90 m/min. These enhancements increase the machine’s versatility and make it easier to adapt cutting parameters to different types of materials. The upper clamp stabilizes stacked workpieces and minimizes movement during cutting. This allows for more efficient cutting of bundles of profiles, tubes, and other repetitive components. Key Advantages Upper material clamp – stable and efficient bundle cutting. Variable blade speed (20–90 m/min) – speed adjustment via frequency inverter. Semi-automatic operation – hydraulic material clamping, saw head lowering, and automatic return. Mitre cutting from -45° to +60° – wide range of cutting applications. Hydraulically operated vise – fast and repeatable workpiece clamping. Infinitely adjustable downfeed rate – greater control over the cutting process. Blade guides with carbide inserts and bearings – precise blade tracking and improved cutting accuracy. Closed-loop coolant system – cools the cutting zone and dissipates heat effectively. Blade tension indicator – convenient monitoring of correct blade tension. Automatic shut-off in the event of blade breakage – enhanced machine protection and safety. Efficient Bundle Cutting Laodeycqhcopfx Akljg The integrated upper clamp allows multiple workpieces to be securely held in place when stacked on top of each other. This is particularly beneficial for serial cutting of profiles, tubes, and other materials with repetitive dimensions. The material is secured both by the hydraulic vise and the upper clamp, reducing movement and lifting of individual pieces within the bundle as the blade passes through the material. Variable Blade Speed Control The blade speed can be continuously adjusted between 20 and 90 m/min. The inverter enables precise adaptation of cutting parameters according to the material type, cross-section, and specific cutting requirements. Semi-Automatic Operating Cycle Once the material is positioned and the cutting cycle is started, the machine automatically performs the following operations: The hydraulic vise clamps the workpiece. The saw head lowers at the preset feed rate. The blade performs the cut. A limit switch detects completion of the cutting cycle. The saw head is hydraulically raised back to its starting position. The swiveling saw head enables cutting angles ranging from -45° to +60°. The material remains stationary while the operator adjusts the required cutting angle by rotating the saw head. Cutting Capacity at 90° Material Type Capacity Round Ø270 mm Square 220 × 220 mm Rectangular 370 × 220 mm Technical Specifications Parameter Value Model CORMAK BS370H Operation Mode Semi-automatic Mitre Cutting Range -45° to +60° Blade Speed Variable, 20–90 m/min Blade Speed Control Frequency inverter Upper Material Clamp Yes – for bundle cutting Blade Size 3160 × 27 × 0.9 mm Blade Tensioning Manual mechanical tensioning Saw Head Feed Control Infinitely variable hydraulic cylinder Vise Operation Hydraulic Vise Base Height 890 mm Power Supply 400 V / 3 Phase Total Power 1.5 kW Coolant Pump Power 46 W Machine Dimensions (with base) 1850 × 950 × 1500 mm Weight 491 kg

Year of construction: 2007, condition: good (used), machine/vehicle number: 073759001, Offer 22489 Technical data: Lasdpfxoim Ilds Akleg - Cutting range at 90°: - Round: 320 mm - Flat: 320 x 320 mm - Material feed system - Saw band dimensions: 5095 x 34 x 1.1 mm - Cutting speed: 10 to 120 m/min - Hydraulic lifting and lowering of the saw frame - Upper stroke limit of the saw frame - Cutting pressure, infinitely adjustable - Hydraulic material clamping device - Chip conveyor - Coolant system - Chip removal conveyor: 2500 mm - Drive: 400 V / 4.0 kW - Space requirement: approx. W 2500 x H 1950 x D 2000 mm - Weight: approx. 2200 kg

Condition: good (used), Year of construction: 2000, Sawcapacity at 90 degree: Round: Ø303 mm Square WxH: 360 x 305 mm Sawcapacity at 45 degree: Round: Ø265 mm Square WxH: 265 x 300 mm Sawcapacity at 30 degree: Round: Ø175 mm Square WxH: 175 x 300 mm Lasdpsw Rz Shofx Aklsg

Condition: new, – Semi-automatic – Hydraulic – 2 speeds: 40/80 m/min – Double miter – Hydraulically adjustable sawing pressure – Cooling system – Saw blade 3960 x 27 x 0.9 mm – Emergency stop Lasdpfx Aewin Rvskljg – Documentation – 400V

Condition: used, Year of construction: 1968, roll diameter 500 mm throat 1050 / 485 mm workpiece height 300 mm saw band length 3920 - 4050 mm cutting speed 15 - 940 m/min table height 1040 mm table surface area 750 x 800 mm Table tiltable 15 Grad total power requirement 4,0 kW weight of the machine ca. 1750 kg dimensions of the machine ca. 2100 x 1000 x 2100 mm - Unique mitering range left/right up to 30° acute angle - Mitering adjustment via lockable detent every 15° - Adjustable saw blade for optimum cutting angle - Hydraulic clamping device on both sides - Electric blade breakage monitoring - Smooth-running saw carriage via preloaded recirculating ball bearings - Additional table 450 x 450 - Machine light Ljdpfx Akoiqp Eroloag

Condition: new, For technical specifications, see the PDF file. Lsdpfjxp Hyysx Akloag

Year of construction: 1986, condition: good (used), Automatic operation Feed with position control, min. Cut-off length 8 mm, Feed stroke max. 400 mm, for cut-off lengths over 400 mm, the stroke is repeated until the set dimension is reached. until the set dimension is reached. The cut-off length is displayed digitally. The desired number of cuts can be preselected. Sheet tear control, Chip scraper brush, chip conveyor, Laedpfxepxnkgs Aklsg roller conveyor, support length 3 m, 5 new saw bands Cutting range round: 320 mm Rectangular cutting area: 320 x 320 mm Saw blade dimensions: 5250/5350 x 32 x 1.1 mm Band speed: 15 - 110 m/min Saw drive: 380 V, 4 kW Weight: 2200 kg Operating instructions, electrical and hydraulic circuit diagrams, Spare parts list

Condition: new, cutting diameter 300 mm capacity 90 degrees: flat 330 x 260 mm capacity 90 degrees: square 260 x 260 mm Ljdpjxaagbefx Aklsag capacity 45 degrees: flat 270 x 200 mm capacity 45 degrees: round 260 mm capacity 45 degrees: square 250 x 250 mm capacity 60 degrees: flat 170 x 170 mm capacity 60 degrees: square 170 x 170 mm capacity 60 degrees: round 180 mm turning speed range: 40 / 80 m/min dimensions of saw-band 3650 x 27 x 0,9 mm engine output 1,5 / 1,8 kW weight 670 kg Equipment: - robust electro-hydraulic semi-automatic band saw (INDUSTRY) - with miter cuts from 45° right to 60° left * Miter adjustment via large turntable - MEP microprocessor control EVO to control all functions * front right, rotatable - optional manual or automatic lowering of the saw bow * stepless adjustment of the saw bow lowering - saw band guide made of hard metal plates - hydraulic saw band tension - including digital value display - 2x saw band speeds - 1x BI-metal saw band - 1x angle stop - chip removal brush - machine base frame with forklift pockets - operating instructions in German Functioning of semi-automatic operation: - electro-hydraulic clamping of the vice - electro-hydraulic lowering of the saw bow - electro-hydraulic raising of the saw bow - electro-hydraulic opening of the vice SPECIAL ACCESSORIES INCLUDED: - MEP LubeCut micro dosing device