Model 3020 Infrared Diameter Measuring Instrument 0.2~16 mm Product Name DDM-3020 Outside Diameter Measuring Instrument Nominal measuring range≤20MM Recommended measuring range 0.2~16MM Connect RS-485 Scanning rate 1800 times / sec Centre height adjustable range 850-1100mm Measurement accuracy ± (0.002MM + 0.02% of the reading value of the calibrator) Power consumption <10w