Professional LED photometer The AP-881D offers a wide measuring range from 0.1 to 400,000 Lux / 1 to 40,000FC. Whether you are a photographer, designer or plant lover, the AOPUTTRIVER photometer will meet all your requirements. Leveling accuracy 4% rdg 0.5% fs (minus 10,000 Lux; 1000 FC) / 5% rdg 10 dgt (over 10,000 Lux; 1,000 FC); Resolution: 0.1 Lux / 0.01 Fc; 0.1 - 400,000 Lux / 1 - 40,000 FC; Measuring speed: 2 times / second. 270 degree rotary detector Keep an eye on the light level anywhere in the room; The light meter sensor can rotate 270 degrees, so you don't need to move the light meter, you just need to rotate the degrees to measure the light you need. Multifunction and easy to use Fast response, auto zero, peak data hold and data hold switches, low power consumption, MAX / MIN hold, relative value, / switch, with LCD backlight.