Features 1、This PH test pen has a large‑screen digital display and a backlight function. 2、The product has a simple operation panel, the instrument is easy to operate 3、Economical and practical, fully meets the testing needs of various industries. 4、The measuring result of the test pen is accurate, easy to carry and easy to read. 5、Suitable for many situations, such as food manufacturing, breeding, industry, swimming pools, etc. Specification Item Type: PH Test Pen Model: OW-9902 Material: ABS Battery: 3 x 1.5V LR44 (Battery Not Included) Application: Industry and agriculture, environmental protection, breeding, food manufacturing, water purification, swimming pools, etc. PH: 0.00-14.00PH 0.01PH ±0.05PH TDS: 1ppm; 0.1ppt ±2%F.S EC: 1-19990μS/cm 1μS/cm, 0.1mS/cm ±2%F.S Working Temperature: 0-60℃ (32-140℉), RH100% Package List 1 x PH Test Pen (Battery Not Included) 3 x PH Powder 1 x Manual