Test samples anywhere with the Thermo Scientificâ„¢ Orion Starâ„¢ A324 pH/ISE Portable Multiparameter Meter. This rugged, dependable meter is one of the top choices for testing every sample, every day, everywhere. Get the information you need quickly and easily from the large, backlit graphic LCD display; informative display shows pH/mV/RmV and temperature, along with electrode status, time, date, sample ID, user ID and calibration points.