[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 uses an ultra sensor to quickly and accurately measure water level and a thermal sensor to measure temperature. [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 meters, accuracy: ±0.03 meters. [Multifunctional] The ultra tank level gauge displays room temperature, tank temperature, and water level using a 10-segment LCD bar graph. It stores minimum and maximum records and allows alarm settings for high or low water levels, as well as empty tank alerts. Wireless transmission range up to 100 meters (300 feet) in open areas. This sensor is easy to install and can monitor water tank depth, water temperature, and indoor temperature. Features: - Monitors tank level and displays it via a 10-element LCD bar graph - Stores minimum and maximum liquid level records - Supports high/low water level alarms and empty tank notifications - Displays indoor temperature and tank temperature simultaneously - 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 1.0 inches) - Receiver weight: 93g (3.3 oz) - Transmitter dimensions: 155 x 95 x 65mm (6.1 x 3.7 x 2.6 inches) - Transmitter weight: 125g (4.4 oz) - LCD size: 66 x 45mm (2.6 x 1.8 inches) - Packaging dimensions: 165 x 110 x 105mm (6.5 x 4.3 x 4.1 inches) - Package weight: 288g (10.2 oz) Package Contents: 1 x Water level sensor transmitter 1 x Indoor receiver 2 x Screws