Water Testing Equipment, pH Testers, Indicators, Meters and Electrodes from Industrial Water Equipment

HI 255 - Combined pH/mV and EC/TDS/NaCl Meter for Laboratories

The new HI 255 is the product of 26 years of instrument testing and design experience. It is the first laboratory bench meter to simultaneously perform precise, repeatable pH and conductivity measurements. This meter was designed to satisfy the requests of many production and quality control laboratories that need quick multiple parameter measurement results with a single precision instrument. The pH and conductivity circuits have been electrically separated, so that it is not necessary for the two probes to be simultaneously immersed in the same solution. The conductivity probe will not interfere with your pH measurements and the response of the pH electrode is immediately stable.

HI 255 is a high performance instrument that measures within a wide range of multiple parameters. With this single laboratory bench meter you can perform pH, ORP, conductivity, TDS, NaCl percentage and temperature measurements.

pH measurements are automatically compensated for temperature, thanks to the external probe included with the instrument. pH calibration is possible in 1, 2, or 3 points between the 5 available memorized buffers, to ensure a higher level of precision. EC measurements can be compensated according to a reference temperature of 20 or 25°C. The most suitable range of EC and TDS is automatically selected, and EC calibration can be performed at 1 point. EC calibration can be chosen between 6 memorized buffers. Thanks to the logging function, measurements are stored in non volatile memory, and can be downloaded to a PC through the RS232 serial port. In addition to these features, HI 255 is rounded out with GLP features that store the calibration data of any measurement to be displayed upon request.

HI 250 • HI 251 - Bench pH Meters with GLP and 3-point pH Calibration

HI 250 and HI 251 are the next generation of pH meters that combine high technology and affordability with advanced new features. In fact, both instruments can measure pH with centesimal resolution and temperature compensation is automatic. Calibration is possible in 1, 2 or 3 points for higher measurement precision, and both have GLP features to display last calibration data at any time. They are also provided with an internal non volatile memory that can record up to 50 data sets, that can be downloaded to a PC. HI 251 performs ORP measurements and displays pH measurements in the mV relative range. The mV relative range is a new feature: the user can set any point to 0 mV 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. Both models are supplied complete with HI 1131B glass-body pH electrode with BNC connector for general purpose and HI 7669/2W temperature probe.