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. Check indoor temperature, tank temperature, and water level. Store min/max records and set alarms for specific water levels, including high, low, or empty conditions. Transmission range up to 100 meters in open field. Water level displayed on a 10-segment bar graph. Features tank empty alert for safe operation. Low battery indicator included. Time display supports 12-hour or 24-hour format. Tank level can be displayed in meters or feet. Two water level alarm modes: high and low. Power requirements: Receiver: 2 x AA 1.5V batteries (not included) Outdoor transmitter: 6 x AAA 1.5V batteries (not included) Indoor temperature range: 0 to 60 degrees Celsius Outdoor temperature range: -40 to 60 degrees Celsius Temperature accuracy: 1 degree Celsius Water level measurement range: 0 to 15 meters Resolution: 0.01 meter Accuracy: 0.03 meters Color: white and 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 actual product. Measurement error allowance is 1-3 cm.