Ohaus Starter 300 Portable pH MetersConvenient Portable pH Meter for Wherever Your Work Takes You Automatic and manual temperature compensation ensures accurate readings while a 30 measurement library stores data for future reference. The auto buffer recognition stores calibration data and helps to avoid errors during the calibration process. With a meter stand, wrist strap for secure field use and IP54 housing, Starter 300 is durable and prepared for versatile use. The ST300 G is