- Precise water measurement: monitor water level in your tank with accuracy ±0.05 m and a resolution of 0.01 m. Measures water levels from 1 to 5 metres and displays temperatures from -40 C to 60 C. - Solar charging: the transmitter has a built-in solar panel that automatically charges the 6 AAA NiMH batteries in sunlight. Environmentally friendly and low maintenance for long-term use. - Versatile functions: backlight, 12/24 hour time display, alarm mode and indoor temperature display in C/F. Suitable for a range of monitoring needs. - Weatherproof design: the transmitter has IP65 protection rating and resists rain from all directions, for outdoor use. The receiver can be powered by AAA batteries or via USB-C. - Practical use scenarios: use in home water tanks for real-time level and temperature updates; monitor irrigation systems on farms; track outdoor water storage or greenhouse water management.