YSI TruLab pH 1310P [1AA320PY] Single Channel Benchtop Meter With Integral Printer (Instrument Only). The YSI TruLab pH 1310 and 1310P are single channel benchtop meters that measure pH, mV (ORP) and temperature. Their accuracy and the ease with which they can be calibrated make them ideal for use in laboratory settings. Both units are EPA approved for drinking water and wastewater compliance reporting of pH. The 1310P also has an integral printer for recordkeeping. The TruLab pH 1310 and 1310P have wide measurement ranges and includes both manual and automatic temperature compensation as well as an AutoRead function that indicates when a stable measurement is reached, improving repeatability. Results are shown on a large, easy-to-read backlit display. An internal memory can hold up to 500 data sets via manual logging and up to 5,000 data sets with auto logging. The TruLab pH 1310 and 1310P can be calibrated via 1, 2, 3, 4 or 5-point calibration for pH and have 22 stored buffer sets for auto-buffer recognition and easy calibration. An adjustable timer that indicates when to perform the next calibration routine, improving measurement accuracy.