LED pool thermometer for fish tanks with waterproof probe and accurate readings1. Alarm swftch: Long press the button to enter the function, short press the up button to turn on/off the alarm switch<br> 2. Set the upper limit of temperature alarm: Press the key again to set the temperature upper limit alarm value, and press the up/down to adjust the alarm value<br> 3. Set the lower limit of temperature alarm: Press the key again to set the temperature lower limit alarm value, press the up/down to adjust the alarm value<br> Measurement range :-40 C~ 150 C<br> Probe length:<br> Power cord length:1.5m<br> Instructions:<br> Key function<br> 1.<br> Enter function<br> 2. Up key<br> Adjust and<br> 3. Down key<br> Adjust setting value reduction and<br> The order of key function is:<br> 1. Alarm switch;<br> 2. Set the upper limit of temperature alarm<br> 3. Set the lower limit of temperature alarm<br> Plug Type:EU Plug,it applies to Indonesia, , , , and so on<br> Material: Plastic + Metal<br> colour: As shown<br> Package Contents:<br> 1 x Pool Thermometer<br> 1 x Probe()<br> Only the above package content, other are not included.<br> Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.