Title: It works - if you know what to look for
Review: This is NOT a belt deflection gauge, it is a belt tension gauge. You will likely need your factory service manual to get the true tension measurements. Most manuals will say something like "1/2 inch deflection at 20lbs of pressure" - this will NOT measure that. In the FSM, it will have specifications more like "80lbs (or it will be in newton meters more likely) - that is what this gauge measures. Both specifications would end up with the same "tightness" to the belt, just different measurements. These have been around forever and almost every professional technician will have one in their toolbox. Shop around on price, NAPA sells them for quite a bit less than here.
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