This Thermo Scientific Orion Star A111 pH Benchtop Meter makes it easy and affordable to take simple, accurate pH measurements. The large LCD display shows pH or mV readings along with temperature. Icons provide quick updates on battery life, electrode status and calibration information. Simple button layout and onscreen messages help with calibration and setup menu choices. The AUTO-READ locks in the stable reading on your screen and ready indicator alerts when readings are stable. Up to three point pH calibration. Automatic recognition of USA/NIST and DIN buffers. Easily recall calibration slope data for procedure checks. The non-volatile memory holds up to 50 data points. Included electrode arm and newly-designed probe holder make it easier to maintain and place probes into samples. Plug the meter into almost any power outlet with the included universal power adapter, or use four AA batteries (sold separately) to run the meter on DC power. The IP54-rated housing can handle splashes and can be wall-mounted if table space is a problem. Certifications: CE, TUV, FCC Class A limits.