[Main Function] The water level sensor records the minimum and maximum water tank levels. When installed on the top of a water tank, the transmitter quickly and accurately measures water level using an ultrasonic sensor, and temperature using a thermal sensor. [Convenient] The display shows both indoor temperature and water tank temperature simultaneously. The receiver can be placed on a table or mounted on a wall for convenient daily use. [Wide Range] Indoor temperature range: 0°C to 60°C; outdoor temperature range: -40°C to 60°C; temperature accuracy: ±1°C. Water level measurement range: 0 to 15 meters, resolution: 0.01 meter, accuracy: ±0.03 meters. [Multifunctional] Ultrasonic tank level gauge displays room temperature, water tank temperature, and water level (shown as a 10-segment bar graph). It stores min/max records and allows setting alarms for high/low water levels or empty tank conditions. Wireless transmission distance up to 30 meters (98 feet) in open area. This water level sensor is easy to install and use, capable of monitoring water tank depth, water temperature, and indoor temperature. Features: - Monitors tank level and displays it with a 10-element LCD bar graph - Stores minimum and maximum liquid level records - Supports high/low water level alarms and empty tank alerts - Displays indoor temperature and tank temperature at the same time - Receiver can be tabletop or wall-mounted Specifications: - Main material: Plastic - Color: White + Black - Indoor temperature range: 0°C to 60°C - Outdoor temperature range: -40°C to 60°C - Temperature accuracy: ±1°C - Water level measurement range: 0 to 15m - Resolution: 0.01m - Accuracy: ±0.03m - Transmission frequency: 433 MHz - Transmission range: 100 meters (300 feet) in open area - Transmission interval: 30 seconds when level changes, 3 minutes when 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: Up to 12 months for receiver and 12 months for transmitter - Receiver dimensions: 105 x 93 x 25mm / 4.1 x 3.7 x 1.0in - Receiver weight: 93g / 3.3oz - Transmitter dimensions: 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 - Packaging dimensions: 165 x 110 x 105mm / 6.5 x 4.3 x 4.1in - Package weight: 288g / 10.2oz Package Contents: 1 x Water Level Sensor Transmitter 1 x Indoor Receiver 2 x Screws