This meter allows you to monitor the outdoor water tank level without leaving the living room. Mount it on top of your water tank to measure precise temperature using an ultrasonic sensor. Check indoor temperature, tank temperature, and water level. Store min/max records and set alarms for specific water levels (high/low) or when empty. Transmission range up to 100 meters (free field). Water level displayed on a 10-element bar graph. Features tank empty alert and low battery indicator. Time display in 12/24-hour format. Tank level display in meters or feet. Two tank level alarm modes: high and low. Powered by: Receiver: 2 x AA 1.5V (not included) Outdoor transmitter: 6 x AAA 1.5V (not included) Indoor temperature range: 0°C to 60°C Outdoor temperature range: -40°C to 60°C Temperature accuracy: ±1°C Water level measurement range: 0 to 15 meters Resolution: 0.01 meters Accuracy: ±0.03 meters Color: white + black Material: plastic Package Contents: 1 x Water Level Sensor Transmitter 1 x Indoor Receiver 2 x Screws Only the above package content is included; other items are not part of this package. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is ±1-3 cm.