BJQF-1 contact-type Crack width gauge is widely used in Bridges, tunnels, buildings, concrete road, such as metal surface crack width of the accurate detection. Technical parameters: Lord probe: special CCD digital camera Controller: dedicated handheld controller Display mode: automatic save and crack width according to numerical calculation Detection range: 0-3 mm Accuracy: 0.02 mm Magnification: 60 times Image formats: JPEG format (store photos are about 10 k) Memory capacity: built-in memory (can connect SD card memory expanding) Interface transfer: USB2.0 Probe battery: special lithium battery Working temperature: - 20 ℃ ~ 60 ℃ The weight: 1000 g