Features: This meter monitors tank liquid depth level, and displays on a 10-elements LCD bar graph It can keep min or max records of tank liquid level Supports tank liquid level high or 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: Whiteandblack 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.