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(Fast measurement and simple calibration function) The proprietary high performance SLAM and special glass electrodes have been significantly reduced to the stability of the measurement value from about 30 seconds to about 4 seconds. In addition, the calibration agent (PH4.00/PH6.86/PH9.18) has been able to automatically recognize the calibration agent (PH4.00/PH6.86/PH9.18) which makes the calibration much simpler, easier and faster. (High Precision, With Calibration Agent) Measuring Range: 0.00 - 14.00 pH (Resolution 0.01 pH), Measurement Accuracy: +0.01 pH (@20 °C), ±0.02 pH, PH4.00 / PH6.86 / PH9.18 calibration agent can be performed. Set Includes: 1. PH measuring instrument, 2 LR44 button batteries, 3. Calibration agent (PH4.00/6.86/9.18), 4. Japanese instruction manual (English language not guaranteed) Press the power button, dip the electrode into the solution, shake it several times, and wait a few seconds to get the measurement values. With automatic calibration function, it is easy to use even for beginners. Easy to Read: Equipped with an LCD screen, this product is easy to read with a larger number compared to the test paper and test liquid. Practical: This PH measuring device can test water for hydroponics, aquatic cultivation, tropical fish breeding, pools, aquariums, rivers, and more. Small pen design makes it convenient to carry and store, perfect for home, school, laboratory, etc. Safe Japanese Manufacturer Quality: We undergo strict quality control. In the event that there is an initial defect, you can rest assured that you can exchange it according to the regulation quality assurance.