The Myron L TechPro II Handheld Conductivity TpH1 Meter is handheld, lightweight, and simple to operate. Measuring conductivity, TDS, pH and temperature, the highly stable circuitry delivers the accurate readings needed to assure product quality, prevent equipment damage or verify inline instrumentation in a wide range of applications. The rugged, waterproof case protects the electronics of the instrument and fits comfortably in your hand. This model also features auto shut-off to prolong battery life.