Works with almost all Ion Selective Electrodes with BNC connectors Reads ion concentration, mV, pH and temperature Preprogrammed calibration points lets even beginners take readings in minutes Hold function; Auto-off The economical Acorn Ion 6 meter reads ion concentration (ppm), pH, mV and temperature! Uses almost any Ion selective electrode to measure dozens of ion species. This rugged, compact meter is very easy to use. mV mode lets you check electrode performance. All push button operation allows fast, easy use. Optional rubber boot protects meter and features a built-in stand. Batteries not included View more great items