Gauge reads 10 to 20 lbs and even fluctuates. Measured against several well known good air compressor gauges as well as Mitivac. It was too cheap to bother with returns so I opened it up to see what I could find. Everything was fine inside, there were no obvious obstacles. The sensor faceplate isn't adjustable, meaning you can't rotate it to correct for inaccuracies (disputed as it reads differently each time you apply pressure/vacuum). Not necessarily a disadvantage per se, but the backlight is a BRIGHT blue LED.
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