HIGH ACCURACY--Every ETENWOLF's pencil tire gauge is calibrated to ANSI B40.1 Grade B, ANSI means it is a standard made by American National Standards Institute, Grade B means commercial gauge, it is accurate to 2% of span in the middle 50% of range and...

PROCESS LEVEL ACCURACY: Each ETENWOLF’s digital tire pressure gauge is calibrated manually to ANSI B40.7 Level Grade 2A(±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...