Features: This meter monitors tank liquid depth level and displays it on a 10-element LCD bar graph. It can store min/max records of tank liquid level. Supports high/low level alarms and tank empty alerts. Displays indoor temperature (℉ or ℃) and tank temperature (℉ or ℃) simultaneously. The receiver can be placed on a desk or mounted on a wall. Specification: Transmission distance: up to 100 meters (in open space) Frequency: 433MHz Indoor temperature range: -50℃ to 0℃ Resolution: 1℃ Accuracy: ±1℃ Tank temperature measurement range: -60℃ to -40℃ Resolution: 1℃ Accuracy: ±1℃ Water level measurement range: 0-15m Resolution: 0.01m Accuracy: ±0.03m Alarm duration: 120 seconds Power consumption: Indoor receiver: 2 x AA 1.5V batteries (not included) Tank transmitter: 6 x AAA 1.5V batteries (not included) Material: plastic Color: White + Black Package Contents: 1 x Transmitter 1 x Receiver Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement error allowance is +/- 1-3 cm.