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Can't stand having to use a tire pressure gauge? Use Accu-Pressure Safety Caps instead! These high or low pressure caps use a red-yellow-green display to let you know when your tire pressure is too low. Just add the cap to the valve stem of your tire and you'll be able to monitor the pressure at a glance. Green indicates a properly inflated tire, while red warns that the tire pressure is too low. Increase your gas mileage and improve your safety by keeping tire pressure worries at bay with Accu-Pressure tire pressure caps!