This meter allows you to monitor the outdoor water tank level from inside your living room. Mount it on top of your water tank to measure precise temperature using an ultrasonic sensor. View indoor temperature, tank temperature, and water level readings. Store min/max records and set alarms for high, low, or empty water levels. Transmission range up to 100 meters in open field. Water level is displayed on a 10-segment bar graph. Features an empty tank alert and low battery indicator. Display supports 12/24-hour time format and water level in meters or feet. Two alarm modes for water level: high and low. Powered by: Receiver: 2 x AA 1.5V batteries (not included) Outdoor transmitter: 6 x AAA 1.5V batteries (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 Note: Light reflection and screen differences may cause slight color variation between the image and the actual item. Measurement may vary by ±1-3 cm.