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The Hanna Checker® Plus makes calibration simple with no manual knobs to turn or screwdrivers needed.  It is supplied with a case and includes 4.01 and 7.01 calibration solutions. Big screen for easy viewing with a stability indicator to alert you when a stable reading has been obtained. Works for over 1,000 hours on one battery.

Note: The only difference between this meter and the GroLine Hi98100 is the coloring and the GroLine trademark.  GroLine trademark is supported by marketing to growers, HI98100 is marketed to general testing needs in all markets. GroLine offers retailers up to a 45% profit margin; non-GroLine such as this meter offers retailers a 30% margin.

Growers can replace the electrode for just $15 giving you a pH meter that can last years. Electrodes on all pH meters fail over time. Having a replaceable electrode means that you don’t have to throw out your meter when this happens. Just unscrew the old electrode and screw in the new one.

Pricing includes the HI98100 Checker, HI1271 pH electrode with cap, 2 x 4.01 buffer solution sachets, 2 x 7.01 buffer solution sachets, 2 x cleaning solution sachets, and plastic carrying case.

  • Extend the life of your pH Checker Plus with a replaceable electrode.
  • Automatic calibration for accurate pH readings every time.


The HI98100 Checker Plus pH tester has been designed with many advanced features while maintaining the look and feel of the original Checker. This digital ph tester now offers automatic calibration to one or two points, automatic buffer recognition, calibrated buffer tags, stability indicator, low battery indicator, and selectable automatic shut off. The Checker plus still maintains the iconic pentagon design with a probe that measures 103 mm in length and tapered to a 8 mm diameter making it ideal for test tubes and vials.

Features at-a-glance:

Economical – The Checker Plus is a full-featured pH tester at a price that anyone that needs to measure pH can afford so that anyone can test ph level at home or at work.

Large LCD - Enhanced LCD that displays reading, stability indicator, low battery indicator and calibration tags.

Replaceable pH Electrode - The HI1271 supplied gel filled pH electrode tapers to an 8 mm diameter at the sensing end. This narrow electrode easily fits into test tubes, vials, and other containers with a small opening.

Automatic Calibration - The Checker Plus is calibrated automatically to one or two points. The calibration buffers are automatically recognized and after calibration the buffer values used are shown on the display as a tag.

Stability Indicator – An hourglass indicator is displayed on the LCD until a stable reading is obtained. Once a reading stabilized the indicator disappears and a reading can be recorded.

Automatic Shut-Off – The meter can be set to automatically turn off after 8 minutes or 60 minutes to conserve battery life in the event that the meter is left on. The auto off feature can be disabled.

Long Battery Life - The Checker Plus has an exceptional long battery life of approximately 1000 hours. When the battery power is running low a low battery indicator is displayed.


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