TireCheck is a valve cap that indicates tire pressure on virtually all cars, SUVs, light trucks, and motorcycles. Since they replace your existing standard valve caps, you don't have to fumble for a gauge or even bend over to check your tire pressure! One size fits all vehicles and provides accurate readings that will register a pressure loss of 2-3 psi or more. TireCheck also helps enhance road handling, increase fuel economy, and extend tire life by keeping you constantly updated on the status of your tire pressure. By Kleen Wheels.
How Will I Know When My Tire Pressure Drops?
When you're good to go, the indicator in the clear plastic-sight glass will be
entirely green. However, if tire pressure drops 2-3 psi, a red indicator will
appear, letting you know to check up on your tires.

Why Use TireCheck?
Tire pressure conditions are a vital safety factor in reducing accidents and
casualties. Recent attention to the importance of proper tire pressure have
subsequently lead to laws requiring new vehicles to be equipped with tire
pressure monitors.