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 and wear-resistant, corrosion-resistant. 3. With high measurement accuracy and stable performance, it can read pH and chlorine values quickly. 4. It can keep your swimming pool or hot spring water within the safe range of chlorine and pH. 5. Small size, suitable for outdoor carrying, helps to detect pH value and chlorine value in various water sources. Specification: Material: ABS PH range: 5.5-9.0ph 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 content for pools and spas: 1.2-1.7 ppm Recommended PH for pool and spa: 7.2-7.8ph Weight: approx. 265g / 9.3oz Product Size: Approx. 180 x 125 mm / 7.1 x 4.9 inches Test lead: approx. 150x20mm / 5.9x0.8in Package list: 1 x water tester (without battery) 1 x sandpaper 1 x User Manual 1. With the exception of water in swimming pools or spas, the detector is not recommended for submersion in water.