Fast, reliable temperature updates: measures from -9.9 to 50.0 °C and refreshes every 5 seconds so you always have current readings for stable aquarium conditions. Long-lasting, rechargeable power: built-in 5V battery with USB-C charging lets the device run up to 45 days with daily temperature checks—ideal for operators who need continuous monitoring without frequent recharging. Simple, practical control: instant reading updates at the touch of a button, automatic shut-off after 30 seconds to save power, and a reliable wireless function for convenient placement and operation. Clear, exposure-independent display: large digital screen with automatic night lighting delivers readable temperatures in direct sunlight and in dark rooms so you can monitor conditions any time of day. Clean, unobtrusive design and wide compatibility: compact, minimal appearance suits all aquarium types and installations without drawing attention from the tank. Common use scenarios Home aquarists: daily quick checks and reliable overnight visibility for tropical or cold-water tanks. Breeders and retailers: frequent monitoring across multiple tanks with fewer battery changes and fast updates to catch temperature fluctuations early. Public displays and low-light environments: clear automatic night lighting ensures staff and visitors can read temperatures in dark tanks or brightly lit exhibition areas. Key specifications and functions Update speed: 5 seconds Measuring range: -9.9 to 50.0 °C Power: built-in 5V battery, USB-C charging Battery runtime: up to 45 days with daily temperature checks Controls: instant-update button, auto shut-off after 30 seconds Readability: large digital display with automatic night lighting Other: reliable wireless function, suitable for all aquarium types What this solves Eliminates guesswork with fast, accurate temperature updates Reduces maintenance time and recharge cycles for busy operators Ensures readable, dependable measurements in any lighting condition Fits cleanly into any aquarium setup without compromising aesthetics