Works in a pinch and is better than nothing, but I wouldn't recommend it for long-term measurements. Just spend the extra $20 and get something good that will last you a lifetime. It will not be zero. -1 is apparently its zero. It's definitely 1 to 2 psi. During the day when the sun is shining it is also very difficult to see. The tinted lens was a terrible idea. Works for my application that uses supply boost and only uses it to monitor boost/vacuum leaks. But for those looking for consistency and accuracy, this isn't an indicator. You get what you pay for.
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