The instrument is powered by a 3.7V lithium direct-charge battery and can be connected to an external power adapter for worry-free measurements. The instrument's button design is humanised, comfortable to operate, and the numbers are clear. The instrument has an upper and lower limit alarm function to make the measurement more convenient. A wide range of connectors are supplied as standard, making it easy to use for different measurement needs. The instrument housing is made of ABS engineering material in one casting, strong impact resistance, industrial fine, Manufacturer: QAXRZCUCD