Fast Water Quality Tester for Swimming Pools, Spas, and Aquariums: 1. Dual Parameter Measurement of pH and Residual Chlorine: One device can perform all water quality measurements simultaneously, measuring both pH and free chlorine (Cl₂) levels, and accurately monitoring key water quality indicators for swimming pools and spas. No need to purchase additional instruments, simplifying daily maintenance. 2. Chemical-Free Electronic Detection, 15-Second Reading: Uses a sensitive blade probe, eliminating the need for chemical reagents. Simply clean the probe and place it in the water for 15 seconds to complete the measurement, avoiding errors and the cumbersome handling of traditional test strips. 3. Protects Health and Equipment, Prevents Water Quality Abnormalities: Early detection of water quality abnormalities can prevent diarrhea and skin/ear infections caused by bacterial growth due to insufficient chlorine; it can also prevent chlorine deficiency due to abnormal pH levels, thereby avoiding corrosion of pool pipes and equipment. 4. Easy to Use, Even Beginners Can Easily Operate: No professional knowledge required. The test consists of three steps: cleaning the probe → placing vertically in the water → reading the value; the device is lightweight, compact, comfortable to hold, and easy to operate, making it ideal for daily testing. 5. Designed for Various Recreational Water Environments. Optimized for water quality measurement in swimming pools, hot tubs, and spas, and also suitable for daily monitoring of aquariums. An essential tool for maintaining swimming pools in homes, hotels, and gyms. Instructions for Use: • Before testing, rub the test probe back and forth 10 times with the included sandpaper to clean the probe surface. • Immerse the probe vertically in the water until the black insulating sleeve is completely submerged. Read the value after 15 seconds. • Only for water quality testing in swimming pools, spas, and aquariums. Do not immerse in other liquids. • Recommended Water Quality Standards: Free chlorine content 1.2-1.7 ppm, pH value 7.2-7.8 Specifications: • Main unit dimensions: 190 × 120 mm • Length with handle and probe: 150 mm • Length without handle and probe: 48 mm • Cable length: 130 mm • Power supply: 1 x 1.5V AA alkaline battery (not included) • Weight: 160 g (excluding battery) Package Contents: 1 x Water Quality Tester 1 x User Manual 1 x Sandpaper