Features: 1, laser measurement, high accuracy; 2, the device compact, easy to use; 3, diameter, circumference can be switched; 4, digital products, long life; equipment index :: L 1, the device dimensions (length × width × high) (mm): 225 × 100 × 60 2, measuring range (mm): 500 ~ 3500MM 3, the theoretical measurement accuracy (mm): 0.1mm 4, measurement frequency (Hz): 10 ~ 20 5, laser safety class: 2 Environmental requirements: 1, the working temperature (℃): - 10 ~ 55 2, Storage Temperature (℃): - 20 ~ 75 3, humidity: 30-85% RH non-condensing 4, the input voltage (V) (enclosing battery): 9V