Features: 1) Microprocessor control, fast response 2) High accuracy and repeatability 3) Low consumption, auto shut-off 4) Unify check pressure and tread depth 5) One key operation 6) 2 units (PSI/BAR) changeable 7) Key ring KYTG series digital tire pressure gauge is designed for tire pressure measurement with reasonable design and stable technique. It has characteristics of high accuracy, excellent appearance and super performance, and has been very popular in North American and Europe. We welcome all co-operation opportunities, with customized products available. Functions: 1) Check tire tread depth: 0 - 15mm (±0.3mm accuracy) 2) Check tire pressures range: 0 - 100PSI (max. 120PSI) accuracy of ±2PSI 3) Display: LCD display (1/4in.) 4) Power supply: DC 3V lithium battery 5) Working temperature range: 0 - 40oC (32 - 104oF) Operations: 1) To switch on, pull the slide downwards and then release. The unit beeps and displays 888. Wait until the LCD reads 0.0PSI or 0.00BAR. Unit is now self-calibrated and ready for use 2) To check pressures: check screen display in PSI or BAR, to change PSI or BAR, pull slide down and release. Put air nozzle onto tire valve, wait for one second then remove and check the value 3) To check tread depth: push slide upwards until probe is extended. Put the probe into the tread and then push the unit downwards until it rests on the tire. Lift carefully away from the tire and read the depth in millimeters and tenths of mm. At 1.6mm and below, the display will flash to warn of illegal tire in UK 4) The unit will auto off after 90 seconds, or hold slide down until unit switches off Notes: always be sure to follow the manufacturers recommended pressure ratings which are for cool tire (not driven on) measure before driving