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 alarm and tank empty alert. 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 differences in display screens may cause slight variations in the color of the item shown in the image compared to the actual product. Measurement error allowance is +/- 1-3 cm.