4-in-1 water tester that measures pH, EC, and temperature, delivering a complete view of water quality in a single device. Temperature compensation ensures stable, accurate readings across varying temperatures, so results remain reliable even when conditions change. Waterproof and durable design with a sealed sensor probe and battery cover. Normal use prevents water ingress, providing reliable operation during field or home testing. LCD display with backlight for clear readings in low light. Includes a hold function and automatic shut-off to save energy and extend battery life. Use scenarios - Home aquariums and terrariums: monitor pH, EC, and temperature to maintain a healthy, stable environment for fish, plants, and invertebrates. - Hydroponics and nutrient solutions: track pH and EC to optimize nutrient uptake, while monitoring temperature to protect plant roots. - Pools, spas, and outdoor water features: perform on-site checks of water quality to keep pH balanced and comfortable, with reliable readings even in dim lighting.