ETENWOLF T300 Plus Tire Pressure Gauge 200 PSI, Digital Tire Gauge with Bright LED Display, Tire Gauges for Tire Pressure PROCESS LEVEL ACCURACY: Each ETENWOLF’s digital tire pressure gauge is calibrated manually to ANSI B40.7 Grade 2A((plus-minus 1 PSI) ACCURACY IN EXTREME PRESSURE RANGE: Whether tire pressure is below 12 PSI or above 140 PSI, ETENWOLF’s digital tire gauge is accurate as well ACCURACY IN EXTREME WEATHER: Built-in AI chip with thermal compensation inside, ETENWOLF’s tire gauge works normally even in extreme cold or hot weather(-4°F-130°F/-20°C-54°C) PRESSURE RANGE 3-200 PSI : ETENWOLF’s digital tire pressure gauge can measure pressure of all types of vehicles