HI 4321 is a single-channel, research-grade laboratory EC/Resistivity/TDS/Salinity Bench Meter with a backlit 240 x 320 dot-matrix color screen capable of millesimal measuring resolution. This unit features auto-recognition of probe type (2 or 4 ring and nominal cell constant) and has and extended range from 0.001 µS/cm to 1 S/cm. The user can choose from three different salinity scales (practical salinity, natural sea water and percent) and adjust the temperature compensation from linear to natural water.

An enhanced warning system, including acoustic signals, alerts the user when measuring outside the calibration range. This system also reminds the user when a new calibration is due. HI 4321 performs all 3 stages of USP <645> conductivity tests for water quality. The instrument provides clear directions on how to perform each testing stage, automatically monitors the temperature, conductivity and stability during testing and determines whether a sample is within UPS limits. Equipped with Auto Standard Recognition, this meter supports custom calibration solutions. Obtain up to a 4-point calibration for enhanced accuracy over an extended measuring range.

Features also include real-time graphic displays, on-screen GLP data and a fully customizable SETUP menu. This unit can also be given a unique ID number. The user may consult the on-board contextual help from any mode simply by pressing the HELP menu. All the features are available in English, Italian, French and Spanish. Connect to a PC via the USB and RS232 ports for PC connectivity and access the HI 92000 Windows® compatible data spreadsheet. Equipped with a 12 Vdc power supply.