[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 measures the water level accurately using an ultrasonic sensor and temperature via 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 to 60°C; outdoor temperature range: -40 to 60°C; temperature accuracy: ±1°C. Water level measurement range: 0 to 15 meters, resolution: 0.01 meters, accuracy: ±0.03 meters. [Multifunctional] The ultrasonic tank level gauge displays room temperature, tank temperature, and water level indicated by a 10-segment LCD bar graph. It stores min/max records and allows setting alarms for high, low, or empty water levels. Wireless transmission distance up to 100 meters (300 feet) in open area. This water level sensor is easy to install and helps monitor water tank depth, water temperature, and indoor temperature. Features: - Displays tank level with a 10-element LCD bar graph - Stores minimum and maximum liquid level records - Supports high/low level alarms and empty tank alerts - Simultaneously displays indoor temperature and tank temperature - Receiver can be tabletop or wall-mounted Specifications: - Main material: Plastic - Color: White + Black - Indoor temperature range: 0 to 60°C - Outdoor temperature range: -40 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 LR6 alkaline batteries (not included) - Transmitter battery: 6 x AAA 1.5V LR6 alkaline batteries (not included) - Battery life: Up to 12 months for both receiver and 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