【Main Functions】The water level sensor can record the minimum/maximum record of the water level in the water tank. If installed on top of a water tank, the transmitter will quickly and accurately measure water level via an ultrasonic sensor and temperature via a thermal sensor. [Convenient] The screen can display the temperature inside the tank ( or ) and measure the temperature of the water tank ( or ) at the same time. The receiver can stand on the table or hang on the wall, making it very convenient for daily use. [Wide Range] Indoor temperature range: 0 60; Outdoor temperature range: -40℃ 60℃; Temperature accuracy: 1. Water level measurement range: 0 15m, resolution: 0.01m, accuracy: +/-0.03M. 【Multi-Purpose】The ultrasonic water tank level gauge can display room temperature, temperature and water temperature (represented by a bar graph with 10 elements). You can save min/max records and set alarms for specific water levels (high/low) or emptying. 1 foot effective distance: 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 handy water tank sensor. Features: The liquid level meter monitors the liquid level of the water tank and displays it with a 10-grid LCD bar graph. It keeps minimum/maximum recorded tank levels. Supports tank high/low alarms and tank empty messages. The internal temperature (H or) and the tank temperature (H or) are displayed simultaneously. The receiver can stand on a table or hang on the wall. Specifications: Main material: plastic Color: white + black Indoor temperature range: 0 60 External temperature range: -40 60 Temperature accuracy: 1 Water level measurement range: 0 15m Resolution: 0.01m Accuracy: 0.03m Transmission frequency: 433 MHz transmission range : 100 meters (300 feet) in open area Transmission interval: 30 seconds if level changes; 3 minutes if level does not change Receiver batteries: 2 AA 1.5V LR3 alkaline batteries (not included) Transmitter Receiver battery: 6 AAA 1.5V LR6 alkaline batteries (not included) Battery life: Receiver and battery at least 12 months Transmitter 12 months Receiver size: 105 * 93 * 25mm / 4.1 * 3.7 * 1.0in Receiver Weight: 93g/3.3oz Transmitter size: 155*95*65mm/6.1*3.7*2.6in Transmitter weight: 125g/4.4ozLCD size: 66*45mm/2.6*1.8in Package size: 165*110*105mm/ 6.5*4.3*4.1 inches Packing weight: 288g/10.2oz Packing list: 1*Water level sensor transmitter 1*Indoor receiver 2*Screws