
Caution - LIFETIME IS APPROXIMATELY ONE YEAR! What is not in the description. So I was tricked into buying a couple of years and they will be useless in a year or so! They make good pH paper, but don't buy more than you'll use next year! Otherwise I would add a star or two.

Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
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π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
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Portable Handheld Manometer π for Accurate Pressure Differential Measurement
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