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 the tank is empty. Transmission range up to 100m (free field). Water level is displayed on a 10-element bar graph. Features tank empty alert and low battery indicator. Display time in 12/24-hour format. Tank level can be displayed in meters or feet. Two tank level alarm modes: high and low. Power source: 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 15m Resolution: 0.01m Accuracy: ±0.03m 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, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the actual product. The measurement allowed error is ±1-3cm.