Specifications HI98120 HI98121 pH Range — -2.00 to 16.00 pH Resolution — 0.01 pH Accuracy — ±0.05 pH ORP Range ± 1000 mV ± 1000 mV Resolution 1 mV 1 mV Accuracy ±2 mV ±2 mV Temperature Range -5.0 to 60.0°C / 23.0 to 140.0°F -5.0 to 60.0°C / 23.0 to 140.0°F Resolution 0.1°C / 0.1°F 0.1°C / 0.1°F Accuracy ±0.5°C / ±1°F ±0.5°C / ±1°F Additional Specifications ORP Calibration factory calibrated factory calibrated pH Calibration — automatic, one or two-point with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18) Temperature Compensation — automatic for pH readings Electrodes HI73120 replaceable ORP electrode (included) HI73127 replaceable pH electrode (included); fixed ORP sensor Battery Type / Life 1.5V (4) / approximately 250 hours of continuous use; auto-off after 8 minutes of non-use Environment -5 to 50°C (23 to 122°F); RH max 100% Dimensions / Weight 163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’) / 100 g (3.5 oz.) Ordering Information HI98120 (ORP) is supplied with HI73120 ORP electrode, HI73128 electrode removal tool, 470 mV ORP test solution sachets (6), batteries, and instructions. HI98121 (ORP/pH) is supplied with HI73127 pH electrode, HI73128 electrode removal tool, pH 4.01 buffer solution sachet, pH 7.01 buffer solution sachet, 470 mV ORP test solution sachets (2), pH electrode cleaning solution sachet, pH electrode storage solution sachet, batteries, and instructions. Pocket clip A pocket clip is featured on the back of these testers. Replaceable pH (HI98121) or ORP (HI98120) electrode cartridge The easy-to-replace electrode cartridge features a sturdy, snap-in connector with no pins which could bend or break. Exposed temperature sensor An exposed temperature sensor allows for rapid automatic temperature compensated pH measurements. Protective cap The protective cap features an internal cup that can be filled with storage solution to keep the sensor moist. LCD Display Features Standard or N.I.S.T buffer calibration (HI98121) Automatic calibration is performed with two sets of memorized buffers for greater accuracy. HOLD function The HOLD function “freezes” the LCD display temporarily. On-screen battery life LCD indicates the percentage of battery power remaining upon startup. pH solutions begin on page 2.158; ORP solutions begin on page 2.170 1 Testers and Monitors 1.35 www.hannainst.com | testers
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