PH standard solution PH-4S 1 bottle

In pH measurement using the glass electrode method, reliable data can only be obtained when meter accuracy, electrode performance, and standard solution accuracy are all in sync. Measurement accuracy is determined by calibrating the meter with a standard solution before measuring pH. Thus, the accuracy of the pH standard solution used for calibration is an important factor that directly affects the reliability of the data. TOKO pH standard solution is a highly accurate standard solution based on JIS (Japanese Industrial Standards), so you can use it with confidence. Phthalate standard solution pH value (25℃): 4.01 Accuracy: ±0.02 Please use the 500ml undiluted solution.