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Digital tire pressure gauge Press the button "ON" to Power gauge on,and it displays 0.0PSI Press the button "ON" for long time until it flashed, release the button, then press the button "On" for short time to switch different units for pressure. Please push the nozzle towards tire valve and press for 2 seconds, then remove gauge and it displays test results on LCD display. It can check other tires continuously Digital tread depth gauge Press the button "ON" to Power gauge on,and it display 0.0PSI Press the button "ON" for short time, and it will switch to tread depth gauge mode. Press the button "ON" for a long time until it flashed, release the button, then, re-press the button "On" for short time to switch different unit for depth. Push probe into tire groove, and make gauge tightly close to outer covering of tire. Take away the gauge, LCD will display the depth of tire grooves, also with danger alarm. Window Glass Breaker (keep away from Children) Remove the safety cover. Please make sure that finger will not touch the window after pressing breaker. Please post glass breaker terminal on the glass, press the glass breaker towards the window, then glass will be broken. It can break glass continuously.