The TechPro II Series of meters provide pH, conductivity, and TDS measurements for applications such as boilers and cooling towers, reverse Osmosis, pools and spas, pulp and paper, and many other industries. The meters require only a 1.2-Ml sample for pH measurement and a 5-ml sample for conductivity measurements. Both the temperature-compensated measurement of interest and the sample temperature is displayed on the four-digit LCD. The meters have auto ranging function for greater resolution of your conductivity measurements between 0 and 9999 µs or 10 to 20.00 MS. The meter features an internal, non-refillable pH sensor that protects the glass pH bulb from breakage while allowing field replacement. Simple operation - rinse and fill cell cup and push button to display measurement waterproof ABS housing that Floats push-button calibration automatic temperature compensation to 25°c (77°f).