* In favorable conditions (optimal target surface, room temperature) up to 11.89 m (39 ft). In unfavorable conditions, such as intensive sunshine, very weakly reflecting target surface, or large temperature fluctuations, measuring accuracy may deteriorate to approx. ± 0.01 in/ft for distances above 39 ft.

** Under unfavorable conditions, e.g., for temperature alterations, for a poorly reflecting surface or bright ambient light, the error of measurement can be up to .15 inch. For working range in excess of 98 ft, the accuracy declines by 0.003 in/ft.