Upward measurement accuracy     ±1mm/100m 

Downward measurement accuracy      ±1mm/100m

Leveling  accuracy    ±1″  

Leveling  range ±3°

Field of view    1°50′

Minimum focus distance  0.7m

Wave length   635nm

Working: about 12 h

Battery    4X4.8V  Ni-MH battery

Working temperature  -20℃～+50℃

Weight   3.8kg