Check the listing for details. 5um Slim Glass Scale Linear Encoder 100 150 200 250 300 350 400mm Travel. Condition: New. Listed at 58.05 USD. Slim Linear Scale High accuracy Slim 5um Linear Scale linear encoder 100 150 200 250 300 350 400 450mm travel fit Sino Easson digital readout What is the different between 100mm and 120mm, 150mm and 170mm, 200mm and 220mm.....400mm and 420mm ? They are same scale, because it can read 20mm more. For example, 100mm can read to 120mm, 150mm can read to 170mm, and its total length is same. So we called it 100mm or 120mm, same linear scale. 5Micron Linear Scale/Linear Encoder Specifications 1. Travel (measuring) length: 0-420mm 2. Total (overall) length: Travel length + 120mm 3. Plug: DB9 4. Resolution: 0.005mm 5. Input voltage: 5V 6. Grating pitch: 0.02mm (50LP/min) 7. Cable length: 3 Meter 8. Normal scale dimension: 20*28mm 9.Accuracy:±3/5/8um 10. Output signal:TTL Tips: This linear scale compatible with SINO,Easson , Ditron, Delos, Fivetecnc, Sinpo digital readout, if need to work with other brand, it need to amend the pin wire.Please contact seller for support it. Package includes Linear scale x 1 piece Scale dust cover x 1 piece Mounting L bracket x 1 piece Screws x 1 bag