Usage Tips: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 graph With tank empty alert, safe to use. Low battery indicator Time display at 12/24hr system. Tank level display at metre or feet. Two tank level alarm mode: high/low Battery power: Receiver 2 x AA 1.5V (not included), Outdoor transmitter: 6 x AAA 1.5V (not included) Indoor temperature range:0~60degree Celsius Outdoor temperature range :-40~60degree Celsius Temperature accuracy:±1degree Celsius Water level measure range: 0 ~15m Resolution: 0.01m Accurate: +/-0.03m Colour:white+black Material:plastic Package Contents: 1 x Water Level Sensor Transmitter 1 x Indoor Receiver 2 x Screws Only 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.