Hanna Instruments Laboratory Division has released the HI 250 and HI 251 pH meters, capable of measuring pH with centesimal resolution and offering automatic temperature compensation. Calibration is possible in one, two or three points and both have GLP features to display last calibration data at any time.
The meters have an internal, non-volatile memory that can record up to 50 data sets, which can be downloaded to a PC. The HI 251 performs ORP measurements and displays pH measurements in the mV relative range. The user can set any point to 0mV to verify how much a reading differs from the starting point. This measurement range has been named relative mV range because the displayed values refer to a new zero point.
The HI 250 and HI 251 are supplied with the HI 1131B pH electrode, the HI 7669/2W temperature HI 1131B pH electrode, an electrode refilling solution, an electrode holder, a 12V dc power adapter and instructions.