Product Description 
 DSB-1 Alarm roof subsidence speed is used to predict the underground mine, roof subsidence speed overrun, also can be used for observation of mine, face, tunnels, culverts, etc. deformation speed, small size, easy to operate, display intuitive features. Has higher reliability and security, can be used in the underground for a long time without maintenance. According to the customer need to set upper and lower alarm value, the upper and lower speed alarm value. 
 DSB-1 technical parameters of the roof sinking speed Alarm 
 Range :0-200mm 
 Accuracy: 0.1mm 
 The use of highly :1-4m 
 Speed ??timing :1-240 minutes 
 Supply voltage: ≥ 3.3V 
 Power: three battery pack 
 Display: LCD digital panel light control 
 Environment: coal mine temperature 0-40 ° C, relative humidity of 95% RH 
 Weight: 9Kg