HI 4521 and HI 4522 are research grade, benchtop instruments that feature 8 measurement ranges: pH, ORP (Oxidation Reduction Potential), ISE (HI 4522 only), conductivity, resistivity, TDS, salinity and temperature. These instruments incorporate dual channels with a separate temperature input and support the external reference electrodes required by half cell pH and ISE sensors.
HI 4221 and HI 4222 are research grade pH, ORP and temperature benchtop meters. HI 4222 also incorporates ISE measurements and dual channels.
These instruments are fully user customizable and offer a large logging space to fulfill the demands and versatility needed by research laboratories.