1It can perform pH and ORP measurements at the same time, and can display temperature readings on the LCD, with automatic temperature compensation. 2With waterproof design, waterproof grade is IP65, large screen is easy to read data, doubleline subtitle design structure is ingenious, scientific and reasonable. 3With replaceable pH electrode design, even if the pH electrode is damaged, you do not need to replace the instrument. 4The portable PH test pen is made of ABS material, The measurement is fast, efficient and accurate, which can fully meet your measurement needs. 5Widely used in industry and agriculture, environmental protection, breeding, food manufacturing, water purification, swimming pools, etc. Item Type: Acidity Meter Model: PH-099 Material: ABS Battery: 4 x 1.5V LR44 (Battery Not Included ) Application: Industry and agriculture, environmental protection, breeding, food manufacturing, water purification, swimming pools, etc. Measuring Range PH 0.00~14.00pH ORP -1999~1999mV Temp 0~50 Resolution PH 0.01pH ORP 1mV Temp 0.1 Accuracy PH 0.1pH ORP 5mV Temp 1 Automatic Temperature Compensation 0~501 x PH Meter(Battery Not Included ) 1 x Screwdriver 1 x Manual 1 x Plastic Box 1. When testing, please put the acidity meter vertically to ensure the accuracy of the test value2. When testing, the liquid just doesn't pass the probe3. When placing the battery, please insert the battery correctly according to the instructions in the instructions