The KL-98102 is an ideal pocket tester for educational purposes. Designed with a 0.01 pH resolution and one-point manual calibration through easy-to reach trimmers, it immediately displays pH variations to reflect the smallest change in the sample. With only two operation buttons, it allows immediate and precise response in a concise design. This is a rugged unit that can be used again and again. The probe is even durable enough to be used as a stirrer. The HOLD button will freeze the display reading for your documentation requirements.