I open the box and pull out the sensor and expect luck. Instead, I kept a very intangible stone. When I pressed the power button, absolutely nothing happened. After reading the reviews I opened it up to check the batteries (and there are a lot of them). Checking the batteries, the sensor worked right away, but the button still didn't do anything. That's when I noticed a broken wire and nothing on a switch pin. A minute of soldering iron and everything was fixed. Just tried it on my tires. It's very consistent but doesn't match my level gauge. I have to change my meter to find out which one isn't working. But how about a bit of quality control? Maybe you just try them all before posting? Not every buyer will be so familiar with electronics and a soldering iron. After confirming that the gauge was working, I tested it on my NIST traceable pressure calibration gauge. With a calibration pressure of 35.55 psi, the tire pressure gauge reads 35.2. Not bad for a purchase under $10!
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