Technical index 1)Crack depth test range650 mmTest error10 2)Crack width measurement range08mmWidth measurement accuracy0.01mm 3)Crack depth test data storage6000 sets of test dataAnd can store 100 thousand crack measuring points of the image and width data 4)LCD screen resolution160*128 lattice 5)Built in rechargeable lithium battery, can work continuously for 8 hours; 6)Working temperature-10+50 7)Host volume190mm*183mm*84mm