Features This meter monitors tank liquid depth level, and displays on a 10-element 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. Description:Keep an eye on your outdoor water tank from the comfort of your own living room, up to 100m away. Installed at the top of your water tank, the transmitter unit measures the water level using an ultrasonic sensor and temperature using a thermo sensor. You can hang the receiver unit on a wall or pull out the stand and place it on your kitchen bench top, table or desk.  Specification:Indoor Temperature Range: 0~50℃Outdoor Temperature Range: -40~60℃Temperature Accuracy: ±1oCWater Level Measure Rang: 0~15m            Resolution: 0.01m            Accurate: +/-0.03MTransmission Frequency: 433MHZTransmission Range: 100 meters(300 feet)in open areaTransmission Interval: 30s when level changes or 3 minutes when level does not changeReceiver Battery: 2X AA 1.5V LR3 Alkaline batteries (Not included)Transmitter Battery: 6X AAA 1.5V LR6 Alkaline or lithium batteries (Not included)Battery Life: Minimum 12 months for receiver                  Minimum 12 months for transmitterReceiver Size: 108*94*27mmTransmitter Size: 97*68*152mmLCD Size: 66*45mm(3.3 inch)Suitable Liquid Type: All non-corrosive liquidOpen Distance: Approx.100M/328.1ftEffective Distance : Approx.30M/98.4ft Package Includes:1 x Water Level Sensor Transmitter1 x Indoor Receiver2 x Screws(Batteries are NOT included) Package List