How bad is this cheap laser power meter? | HWLPM Mini 10W vs. Sanwu Tracer 20W

Does a cheap laser power meter even work? Is it precise enough to be usable? In this video, I test the cheapest power meter I have found for sale and compare it to a much more expensive one. I will use lasers of different colors and optical power outputs. Will the cheap one give the same reading as the expensive one? Let's find out! I bought the laser power meters here (not sponsored or affiliated): https://www.laserpointerstore.com/products/pocket-laser-power-meter/ https://www.sanwulasers.com/product/20wlpm My Patreon-page: https://www.patreon.com/Brainiac75 Laser classes explained: https://youtu.be/dd6656CF1IY Human eyes sensitivity to colors, calculate laser lumens: https://youtu.be/lWQ66Z-HqcM Build a beam dump - easy to make: https://youtu.be/rRIlhskMYAM Did you miss one of my videos?: https://www.youtube.com/user/brainiac75/videos FULL MUSIC CREDITS Time codes: 0:01 + 8:37 "Adding the Sun" Kevin MacLeod (incompetech.com) ISRC: USUAN1900041 Time code: 0:51 "Lightless Dawn" Kevin MacLeod (incompetech.com) ISRC: USUAN1100655 Time codes: 2:25 + 4:07 + 10:45 "Perspectives" Kevin MacLeod (incompetech.com) ISRC: USUAN1300027 Time code: 3:01 + 6:51 + 11:26 "Ossuary 6 - Air" by Kevin MacLeod (incompetech.com) ISRC: USUAN1500048 All music above licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/ Time code: 6:23 Mix of two tracks: 1) The Shimmering by fran_ky (freesound.org/s/237363) Licensed under Creative Commons 0 license 2) "Spacial Harvest" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 License http://creativecommons.org/licenses/by/3.0/ ISRC: USUAN1100653 #LaserPowerMeter #Brainiac75