Usage Tips:[Main function] The water level sensor can record the minimum/maximum record of the water tank level. If it is installed on the top of the water tank, the transmitter will quickly and accurately measure the water level through the ultrasonic sensor, and the temperature through the thermal sensor.[Convenient] The screen can display the temperature in the box ( or ) and the temperature of the water tank ( or ) at the same time. The receiver can stand on the table or hung on the wall, which is very convenient for daily use.[Wide Range] Indoor temperature range: 0 60; outside temperature range: -40 60; temperature accuracy: 1. Water level measurement range: 0 15m, resolution: 0.01m, accuracy: +/- 0.03M.[Multi-purpose] Ultrasonic tank level gauge can display the room temperature, temperature and water temperature (represented by a bar graph of 10 elements). You can save min/max records and set alarms for specific water levels (high/low) or emptying.Effective distance of 1 foot: 30m/98.The multifunctional water level sensor is easy to install and use, and can detect water tank depth, water tank temperature, indoor temperature, etc. This is a convenient water tank sensor.characteristic:The level gauge monitors the level of the tank and displays it in a 10-element LCD bar graph.It can keep the minimum/maximum record of the liquid level of the storage tank.Supports tank high/low alarm and tank liquid empty message.The internal temperature (H or ) and the tank temperature (H or ) are displayed at the same time.The receiver can stand on the table or hung on the wall.specification:Main material: plasticColor: white + blackIndoor temperature range: 0 60External temperature range: -40 60Temperature accuracy: 1Water level measurement range: 0 15mResolution: 0.01mAccuracy: 0.03mTransmission frequency: 433 MHzTransmission range: 100 meters (300 feet) in an open areaTransmission interval: if the level changes, it is 30 seconds; if the level does not change, it is 3 minutesReceiver battery: 2 * AA 1.5V LR3 alkaline batteries (not included)Transmitter battery: 6 * AAA 1.5 V LR6 alkaline batteries (not included)Battery life: at least 12 months for receiver and 12 months for transmitterReceiver size: 105 * 93 * 25mm / 4.1 * 3.7 * 1.0inReceiver weight: 93g/3.3ozTransmitter size: 155 * 95 * 65mm / 6.1 * 3.7 * 2.6inTransmitter weight: 125g/4.4ozLCD size: 66 * 45mm / 2.6 * 1.8inPacking size: 165 * 110 * 105mm / 6.5 * 4.3 * 4.1inPackage weight: 288g/10.2ozpacking list:1 *Water level sensor transmitter1 *Indoor receiver2 * Screw