b' Xiaomi Mijia Smart Laser Rangefinder 3mm High Precision 40m Laser Ranging Type-C Charging With Mijia APP Real Scene Measurement \n \nProduct parameter \nProduct model MJJGCJYDO01QW \nDimensions 80x 35x21mm \nProduct net weight 60g \nMeasuring range 0.05*-40m \nMeasurement accuracy \xc2\xb1 (3mm+5 \xc3\x97 10-5 D*) \nCharging parameter 5V =1A \nMinimum display unit 0.001m \nBluetooth transmission distance is about 8m (without obstacles) \n \nProduct List \nLaser rangefinder\xc3\x971 \nCharging cable\xc3\x971 \nInstruction manual x1 \n \nNotice \n1* \xc2\xb13mm high-precision measurement: The measurement accuracy data is related to the actual measurement distance, which can be calculated by the formula \xc2\xb1(3mm+5\xc3\x97 10-5 D*). \n2*The minimum measurement range needs to be measured with a front-end reference. \n3*After fully charged, use the button tester to perform the "power on + laser emission + data measurement + power off" action about every 10 seconds, until the power is out, the test can be cycled continuously for 3000 times. \nClass 4*2 laser has slight radiation and will not cause permanent damage to the retina of the eye, but please do not look directly into the beam. \n5*"D" means actual distance, indoor standard reflective surface environment. In harsh environments such as: too strong sunlight, excessive environmental temperature fluctuations, weak reflection on the reflecting surface, and insufficient battery power, the measurement results will have larger errors. In this case, the effect of using 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; laser \njitter during measurement, etc.\n