Digital Instant Read Thermometer Instruction Manual V20191231 EN FR Product Temperature Probe Lock Button Light Button Display Button Ob 2D Battery Compartment 1. Display: Displays the current temperature. Button: Press once 10 turn on the unit. Press to select which temperature unit to display, Hold for 3 seconds to turn off the unit. 3. LOCK Button: Press once to lock the current temperature, Press again to unlock. 4. LIGHT Button: Press once to turn ON/OFF the back light. 5.