DY-2501A Chloride in raw concrete / aggregate has the best performance to measure ion concentration quickly and accurately. All the equipment such as calibration solution, cleaning solution and sensor needed for measurement is housed in the case, making it easy to carry and use, and it is easy to operate for anyone from calibration to measurement and output. Measurement results can be checked in real time, and there is an in-CPU self-diagnosis function so that the instrument status can be checked in real time and notified immediately to the user in case of an abnormality.