Measurement function: rotational speed, count, peripheral speed Functions: drop proof, maximum minimum average (MAX/MIN/AVE), numerical hold, auto power save (APS) Measurement range (rpm): 30.0 to 99990 Resolution (rpm): 0.01 Detection distance (mm): 50 to 500 Power supply (v):2 x AA碱电池(LR6)(随附) 宽度(mm):71 深度(mm):38 高度(mm):186 电源:2 x aa碱电池(lr6)(lr6)(包括) 持续使用时间 contimul time time time(h):30 h):30 H)方法:非接触类型