Usage Tips:Features: This meter monitors tank liquid depth level, and displays on a 10-elements LCD bar graph It can keep min/max records of tank liquid level Supports tank liquid level high/low alarm and tank liquid empty alert Displays indoor temperature ( or ) and tank temperature ( or ) at the same time The receiver can be put standing on desk or hanging on wall. Specification: Transmission distance: max.100 meters( in open space) Frequency: 433MHz Indoor temperature range: -50-0 Resolution: 1 Accuracy: 1 Tank temperature measure range: -40~-60 Resolution: 1 Accuracy: 1 Water level measure range: 0-15m Resolution: 0.01m Accuracy: 0.03m Alarm duration: 120sec Power consumption: Indoor receiver: 2xAA 1.5V batteries(without) Tank transmitter: 6xAAA 1.5V batteries(without) Material: plastic colour: White+black Package Contents: 1 x transmitter 1 x receiver 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.