This meter allows you to know the state of the outdoor water tank without leaving living room.You can mount it on the top of your water tank, the meter can measure the precise temperature with an ultrasonic sensor.Check your room's temperature, tank temperature and water level.You can store min/max records and set alarms for specific water levels (high/low) or when empty.Transmission range up to 100m (free field)Water level displayed on a 10 elements bar graphWith tank empty alert, safe to use.Low battery indicatorTime display at 12/24hr system.Tank level display at metre or feet.Two tank level alarm mode: high/lowBattery power:Receiver 2 x AA 1.5V (not included),Outdoor transmitter: 6 x AAA 1.5V (not included)Indoor temperature range:0~60degree CelsiusOutdoor temperature range :-40~60degree CelsiusTemperature accuracy:1degree CelsiusWater level measure range: 0 ~15mResolution: 0.01mAccurate: +/-0.03mColour:white+blackMaterial:plasticPackage Contents:1 x Water Level Sensor Transmitter1 x Indoor Receiver2 x ScrewsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.