See at a glance when tires need air; all green, good to go—see some red, check your pressure
Properly inflated tires run cooler and smoother for better fuel economy
Work by detecting drop in original pressure
TireCheck™ fits all standard automotive valve stems — handle pressure range of 20-42 psi. Helps you maintain proper inflation so tires can run cooler for better fuel economy, less wear on tire itself. Here's how they work: Inflate each tire to the correct pressure. Screw TireCheck™ tightly (VERY tightly) onto the tire valve stem by hand. After driving for a few miles, the indicator will become fully operational and the green indicator will show clearly. If a tire loses pressure by approximately 2-3 psi or more, a red indicator flag will show above the green. Make sure to use an accurate pressure gauge. Set of 4. Lifetime warranty.