This ultrasonic water level sensor records the minimum and maximum levels of a water tank. Installed on the tank's top, the transmitter uses an ultrasonic sensor to measure water level and a thermal sensor to measure temperature. The receiver's screen displays both the indoor and tank temperatures simultaneously. It can stand on a table or be wall-mounted for convenient daily use. The unit monitors indoor temperature from 0 to 60 degrees and outside temperature from -40 to 60 degrees with an accuracy of 1 degree. The water level measurement range is 0 to 15m with a resolution of 0.01m and an accuracy of +/- 0.03m. It displays room temperature, tank temperature, and water level via a 10-element LCD bar graph. Functions include saving min/max records and setting alarms for specific high, low, or empty water levels. The wireless transmission has an effective range of 100 meters in an open area. Features: - Monitors tank level and displays it on a 10-element LCD bar graph. - Keeps min/max records of the liquid level. - Supports high, low, and empty tank alarms. - Displays internal and tank temperature simultaneously. - Receiver can stand on a table or be hung on a wall. Specifications: - Main material: Plastic - Color: White and black - Indoor temperature range: 0 to 60 - External temperature range: -40 to 60 - Temperature accuracy: 1 - Water level measurement range: 0 to 15m - Resolution: 0.01m - Accuracy: 0.03m - Transmission frequency: 433 MHz - Transmission range: 100 meters in an open area - Transmission interval: 30 seconds if level changes; 3 minutes if level is stable - Receiver battery: 2 x AA 1.5V LR3 alkaline batteries (not included) - Transmitter battery: 6 x AAA 1.5V LR6 alkaline batteries (not included) - Battery life: At least 12 months for both receiver and transmitter - Receiver size: 105 x 93 x 25mm / 4.1 x 3.7 x 1.0in - Receiver weight: 93g / 3.3oz - Transmitter size: 155 x 95 x 65mm / 6.1 x 3.7 x 2.6in - Transmitter weight: 125g / 4.4oz - LCD size: 66 x 45mm / 2.6 x 1.8in - Package size: 165 x 110 x 105mm / 6.5 x 4.3 x 4.1in - Package weight: 288g / 10.2oz Package Contents: - 1 Water level sensor transmitter - 1 Indoor receiver - 2 Screws