*No more guessing if your tires are properly inflated – just look at valve cap*Automatically displays ‘green’ for proper inflation for 36 PSI; under-inflated turns red*Extend tire life, increase gas mileage and improve vehicle handling & safety with proper inflation*Set of 4 universal screw-on valve caps; for car, SUV & truck tires with 32 PSI pressure requirement*Durable, weather-resistant ABS and clear acrylic constructionAn ingenious vehicle safety tool that pays for itself by helping you lower operating and maintenance costs. Installs instantly – just replace existing valve caps with the Indicator caps; green shows proper 36 PSI air pressure, color changes when pressure drops to 27-28 PSI and full red marking indicates tire pressure has fallen below 27 PSI (use tire-pressure gauge when installing; indicator caps do NOT indicate over-inflation).

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