Just received this unit today. The calibration process was easy and quick. I used the included Fe plate, the unit was shown as "0", use a transparent part and the unit shown (if it was set to mils), the number shown was within tolerance! Finally a device I can rely on. I had Cem-156 and had to rehearse 4-5 times to get a zero install. When I needed it, I had to recalibrate. it was useless. I definitely recommend this product. They even include a list of car manufacturers with color palettes in mils. Nice to have your car within reach. I tested it on my 2016 Toyota Sequoia. I finally have a great colorimeter.
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