LCD Digital readout x 1 Piece Linear scale with dust cover x 3 pieces Power cord x 1 piece Screw x 3 bags L brackets x 3 pieces English manual x 1 piece Tips:The DRO is Sino brand and the scale is Fivetecnc brand. How to choose the scale length? There are 2 methods. Send a message to tell us at message center. We will send the travel by default, instead of the total length of the scale, so pelase tell us working length! SINO SDS2-3VA DRO Futures. The LCD display accepts all Chinese optical linear glass scales and widely used for lathe, drilling, boring and milling machine. Brand:SINO Model: SDS2-3VA Input voltage: AC80V-240V, 50/60Hz Power:15W Input signal: TTL or RS422 Resolution can be set:0.05/0.1/0.2/0.5/2/5/10/20? M Axis Setting Types:Linear Scale or Rotary encoder Screen protecting time: 30/60/90/120 minutes, or close Bit rate:9600, 19200, 38400, 57600, 115200, 5 types. DRO Material: Plastic cover Plug: AU, EU, US DRO dimension:290x180x78mm LCD Screen dimension:155x85mm. The SDS2-3VA offers a high performance universal display console with Milling, Lathe and Grinding functions. This 3 axis model allow up to 3 linear encoders to be connected The DRO SDS2-3VA is a Multifunctional 3 axis digital readout. It can adapt the different needs of machining by modifying the system parameters. It has many graphics machining functions, such as: Arc Calculation function, circular equally dividing holes, drilling hole along an oblique line, Angular Surface Processing, Calculation function, Measurement for Taper Function, Digital Filter Function. These functions bring the easiness for the graphics function. 200 Points Auxiliary Zero Position Function Mid-split Function “mm/inch” Conversion Display Radius/Diameter Switch Display Segmented Error Compensation Linear Error Compensation Power Interruption Memory Sleep Switch Mathematics calculation RS-232-C ineterface (option, cost extra). Linear Glass Scales Features. High Precision Etched glass 2. Resolution : 5um (0.005mm) 0.0002 3. Signal : TTL square wave / EIA-442 (option) 4. Cable length:3meter Scale Length 50,100,150,200,250,300,350,400,450,500,550,600,650,700,750,800,850,900,950,1000mm. Buyers can choose any length under 1000mm scale at the same price. In fact, The scale can be made from 0-3000mm. Scale length above refers to the real travel of the linear scale. Actual physical length is 140mm longer than travel. One inch equuals to 25.4mm. We supply 1um resolution scale, each 1um scale costs an extra 18 USD. What is the different between 100mm and 120mm, 150mm and 170mm, 200mm and 220mm….. 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.