1. Tear off the double-sided adhesive protective film, stick the thermometer to any position under the water level outside the fish tank, leave it for 5 mins, then you can measure the temperature accurately.
2. Long touch 5s to switch ?/?.
3. Touch to display temperature, 10s later close the display.
4. Replace the battery reminder: when the power is low, it will show "LB" every 30s, please replace the battery in time, the battery can be used for long 12 months.
5. Temperature less than 32?/0? display "LE".
6. Temperature greater than 211?/99.99? display "HE".