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 and tank temperature 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°C to +50°C Resolution: 1°C Accuracy: ±1°C Tank temperature measurement range: -40°C to +60°C Resolution: 1°C Accuracy: ±1°C 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 picture compared to the actual product. Measurement error allowance: ±1-3cm.