Function: 1. An excellent water quality testing tool, mainly used to measure pH and chlorine levels in swimming pools, spas, and various water sources. 2. Portable water monitor made of high-quality ABS material, durable, wear-resistant, and corrosion-resistant. 3. Offers high measurement accuracy and stable performance, capable of quickly reading pH and chlorine values. 4. Helps maintain safe chlorine and pH levels in swimming pools or spa water. 5. Compact size suitable for outdoor carrying, ideal for testing pH and chlorine in various water sources. Specification: Material: ABS pH Range: 5.59.0 pH Cl Range: 03.0 ppm Battery: 1 x 1.5V AA Alkaline Battery (battery not included) Usage: Pool Water Quality Tester, pH Test Pen Recommended Chlorine Content for Pools and Spas: 1.21.7 ppm Recommended pH for Pool and Spa: 7.27.8 pH Weight: approx. 265g / 9.3oz Product Size: approx. 180 x 125 mm / 7.1 x 4.9 inches Test Lead: approx. 150 x 20 mm / 5.9 x 0.8 inches Package List: 1 x Water Tester (without battery) 1 x Sandpaper 1 x User Manual Note: Except for water in swimming pools or spas, the detector is not recommended for submersion in water.