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 use, ideal for testing pH and chlorine levels in various water sources. Specification: Material: ABS pH Range: 5.5–9.0 pH Cl₂ Range: 0–3.0 ppm Battery: 1 x 1.5V AA Alkaline Battery (battery not included) Usage: Pool Water Quality Tester, pH Test Pen Recommended Chlorine Level for Pools and Spas: 1.2–1.7 ppm Recommended pH Level for Pools and Spas: 7.2–7.8 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: Do not submerge the device in water except when testing pool or spa water.