To change the unit of measure on the PT1 Thermometer:
1. Make sure the thermometer is in the OFF mode.
2. Hold the button until ONLY °C and °F symbols flash on the right corner of the screen (approximately 8 seconds). Then release the button immediately.
3. Briefly press the button to select the measurement unit you prefer.
4. Once the selected unit symbol flashes on the screen, hold the button until the unit symbol stops flashing (approximately 8 seconds), then release the button, the thermometer will power off automatically.
Reminder: If you do not press and hold the On/Off button for 8 seconds to confirm the unit selected before the screen switches off, the system will consider the switch as a failure and retain the original unit for temperature measurements.