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Hanna Instruments

Advanced pH/ORP Benchtop Meter

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Advanced pH/ORP Benchtop Meter

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HI6221 is a streamlined benchtop meter with a large touch screen display, comprised of a housing and an integrated pH / ORP measurement module. Compact and easy to operate, the benchtop meter is delivered with Hanna Instruments' HI1131B double junction combination pH electrode, together with HI7662-TW temperature probe.

Specification Name




pH Range

pH: -2.0 to 20.0 pH; -2.00 to 20.00 pH; -2.000 to 20.000 pH

pH Resolution

0.1 pH; 0.01 pH; 0.001 pH

pH Accuracy (@25°C/77°F)

±0.1 pH; ±0.01 pH; ±0.002 pH (±1 last significant digit)

pH Calibration

automatic, semiautomatic, manual; up to five-point calibration; eight standard buffers available (1.68, 3.00, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45) and five custom buffers

pH Temperature Compensation

Manual or Automatic

Temperature Range

20.0 to 120.0 °C, -4.0 to 248.0 °F, 253.0 to 393.0 K

Temperature Resolution

0.1 °C / 0.1 °F / 0.1 K

Temperature Accuracy

±0.2 °C / ±0.4 °F / ±0.2 K

pH Electrode

HI1131B glass body

Temperature Probe

HI7662-TW stainless steel temperature probe

Power Supply

DC adapter 100-240AC to 24VDC 2.5A


0 - 50 °C / 32 - 122 °F / 273 - 323 K maximum 95% RH non-condensing


205 x 160 x 77 mm (8.0 x 6.2 x 3.0")


Approximately 1.2 kg (26.5 lbs.)

Ordering Information

HI6221 is supplied with HI1131B pH electrode; HI7662-TW temperature probe; pH calibration starter kit consisting of: pH 4.01 buffer solution sachet (2 pcs.); pH 7.01 buffer solution sachet (4 pcs.); pH 10.01 buffer solution sachet (2 pcs.); HI700601 electrode cleaning solution sachet (2 pcs.); HI7082 3.5M KCl electrolyte solution (30 mL); HI764060 electrode holder; capillary pipette; 24 VDC power adapter; USB-C to USB-A cable; quick reference guide with instrument quality certificate.


2 years


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Advanced pH/ORP Benchtop Meter (includes HI1131B pH electrode and HI7662-TW temp probe)
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