ultrasonic water tank liquid depth level meter sensor with temperature display 3.3 inch led display supports tank liquid level high/low alarm walfront description: <br> keep an eye on your outdoor water tank from the comfort of your own living room, up to 100m away. installed at the top of your water tank, the transmitter unit measures the water level using an ultrasonic sensor and temperature using a thermo sensor. you can hang the receiver unit on a wall or pull out the stand and place it on your kitchen bench top, table or desk. view your room's temperature, tank temperature and water level (represented by a 10 element bar graph). you can store min/max records and set alarms for specific water levels (high/low) or when empty. <br> specification: <br> indoor temperature range: 0~60 <br> outdoor temperature range: -40~60 <br> temperature accuracy: ±1oc <br> water level measure rang: 0~15m <br> resolution: 0.01m <br> accurate: +/-0.03m <br> transmission frequency: 433mhz <br> transmission range: 100 meters(300 feet)in open area <br> transmission interval: 30s when level changes or 3 minutes when level does not change <br> receiver battery: 2x aa 1.5v lr3 alkaline batteries (not included) <br> transmitter battery: 6x aaa 1.5v lr6 alkaline or lithium batteries (not included) <br> battery life: minimum 12 months for receiver <br> minimum 12 months for transmitter <br> receiver size: 108*94*27mm <br> transmitter size: 97*68*152mm <br> lcd size: 66*45mm(3.3 inch) <br> package includes: <br> 1 x water level sensor transmitter <br> 1 x indoor receiver <br> 2 x screws <br> (batteries are not included) <br><br>note:<br> note that the product is not waterproof.<br> 1. install the battery in the battery compartment of the transmitter, do not insert the battery compartment, and insert the battery synchronously after the receiver is set up <br> 2. the liquid level indicator has no data, press the tank key, and the data will be displayed.<br> 3. when reset, remove the battery wait for a while and then turn on the power to eliminate the remai