Light Meters, AP-881D Lux Meter with Ambient Temperature（℃/℉）Measurer Light 0.01~400,000 Lux (0.01~40,000 FC), Luxmeter with 270º Rotated Sensor, Back Light, Data storag for Plants LED Indoor Lights

Great for measuring relative brightness of light sources. Swiveling head allows pointing at light source and still being able to read LCD screen. Has a backlight for low-light use. Easy to use controls although the instructions and not wonderful, and contain some errors. Cannot speak for accuracy as that would require a calibrated reference source, which I do not have, but the reading ARE consistent.

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there are various settings about what units to use for measuring light.the sensor head can rotate, which is an advantage if you want to read the LCDwhile also pointing the unit at the light sourceI am not in the position to verify accuracy of the readings, so cannot comment about that

What is there to say? It works, it's fairly inexpensive and it has a little bit more features than the average one in the price range. It has helped me correctly place my lights, I was worried I was giving my plants too much light and this helped me figure out correct placement on them. I am no seeing better growth since I was able to increase the LUX with out going too high.

Excellent switch actuation, and good LCD resolution. Overall good quality. The swivel light receiver is nice but not many people probably use this feature. They could lower the cost a couple sheckles if they designed out the swivel light cup.Meter has good response but I'm not sure of the accuracy without having it calibrated. I think it is accurate enough for my purposes. I do know it has taken the guess work out of setting a light source to "object" distance.