Yellow Tommy IR40 Smart Laser Rangefinder 40M Laser Tape Measure Mini Measuring Tape IR40 Rangefinder Non-magnetic Electronic Level  (4000 cm)

*Measurement range minimum needs to be measured with front reference. *After fully charged, use the button tester to perform the action of "start up + laser emission +data measurement + shut down" about every 10 seconds until the power is exhausted, and the cycle test can be performed continuously for 3000 times. *Rank 2 laser has slight radiation and will not cause permanent damage to the retina of the eye, but please do not look directly at the beam. *"D" means actual distance, indoor standard reflective surface environment. In harsh environments such as: the sunlight is too strong, the ambient temperature fluctuates greatly, so that the reflection effect of the reflective surface is weak. And the measurement results will have a large error when the battery power is insufficient. In this case, the use of the target reflector is better. There are also situations that affect the measurement: the objective lens or laser tube is blocked by foreign objects; the measurement target is not clear, such as water surface, glass, mirror surface; the laser shakes during measurement, etc.