Simple, accurate, and affordable pH testing with the convenience of a replaceable electrode. The Hanna HI98100 Checker® Plus pH Tester delivers reliable ±0.2 pH accuracy in a compact, pocket-sized design, making it ideal for environmental testing, field work, and laboratory applications where quick, dependable measurements are essential.
Key Features & Benefits
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Replaceable electrode – HI1271 tapered electrode extends tester life indefinitely with simple screw-on replacement
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±0.2 pH accuracy – Professional-grade precision for reliable results
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Exceptional battery life – Up to 1000 hours continuous use with CR2032 Li-ion battery
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Automatic calibration – One or two-point auto calibration with buffer recognition
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Stability indicator – On-screen icon ensures confident, stable readings
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Compact & portable – Pocket-sized design perfect for on-the-go testing
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Complete starter kit – Includes electrode, buffers, cleaning solution, storage solution, and battery
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Selectable auto-off – Conserves battery life if accidentally left on
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Large LCD display – Easy-to-read from any angle
Why Choose the Checker® Plus?
The HI98100 Checker® Plus bridges the gap between disposable pH testers and expensive laboratory meters. With a replaceable electrode system, you get the accuracy and longevity of a professional pH meter at a fraction of the cost. When the electrode eventually wears out, simply unscrew it and replace it—no need to buy an entirely new tester.
Replaceable Electrode Advantage
HI1271 Tapered pH Electrode
The supplied HI1271 pH electrode is specifically designed for versatility and convenience:
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Tapered design: 103 mm long, tapering to 8 mm diameter at the sensing end
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Perfect for small containers: Easily fits into test tubes, vials, and narrow-mouth bottles
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Plastic body: Durable construction significantly reduces maintenance requirements
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No-hassle replacement: Simple screw-on/screw-off design—no tools required
This replaceable design means your investment is protected. Instead of discarding the entire tester when the electrode degrades, you simply replace the electrode and continue testing.
Advanced Features for Confident Testing
Stability Indicator
An on-screen stability indicator ensures the highest level of confidence in your results. The indicator monitors the reading and only disappears when a stable measurement is achieved, eliminating guesswork and ensuring accuracy.
Automatic Calibration
The HI98100 features automatic one or two-point calibration with buffer recognition. Simply immerse the electrode in standard buffer solutions, and the tester automatically recognizes and calibrates to the correct values.
Selectable Auto-Off
The selectable auto-off feature prolongs battery life for peace of mind and energy savings if the meter is accidentally left on. Choose the setting that best fits your workflow.
Exceptional Battery Life
The included CR2032 Li-ion battery provides up to 1000 hours of continuous use—one of the longest battery lives in its class. A battery icon blinks on the display when it's time to change the battery, so you never miss a measurement.
Large LCD Display
The compact size makes the HI98100 Checker® Plus ideal for on-the-go testing, while the large LCD display provides at-a-glance readings from any angle. Single-button operation streamlines the testing process for any user.
Complete Kit - Ready to Test
We believe that buying a tester should be simple. Your HI98100 Checker® Plus pH tester is equipped with everything you need for successful testing right out of the box:
HI1271 pH Electrode
Tapered design with plastic body for versatile, low-maintenance testing.
Electrode Cleaning Solution
Engineered cleaning solution keeps your electrode free from buildup. This concentrated combination of detergents cleans your tester quickly and effectively so that your tester stays in optimum condition.
pH 4 & 7 Buffer Sachets
When performing a pH calibration, it's important that the correct buffers are used. We include starter buffers to get you going. The single-use sachets are individually sealed so you use fresh buffer each time you calibrate.
Storage Solution
Proper storage of your electrode will ensure reliable measurements and a long electrode life. Our storage solution is specially formulated to keep the pH glass hydrated while minimizing organic growth.
CR2032 Battery
Pre-installed battery provides up to 1000 hours of continuous use.
Applications
- Environmental water testing
- Field sampling and analysis
- Laboratory quality control
- Educational and research labs
- Aquaculture and aquariums
- Hydroponics and agriculture
- Food and beverage testing
- Wastewater monitoring
- Pool and spa maintenance
- General-purpose pH measurement
Technical Specifications
| Specification |
Detail |
| SKU |
HI98100 |
| pH Range |
0.0 to 14.0 pH |
| pH Resolution |
0.1 pH |
| pH Accuracy |
±0.2 pH |
| Calibration |
Automatic, one or two-point |
| pH Electrode |
HI1271 replaceable pH electrode (tapered, 103 mm, plastic body) |
| Battery Type / Life |
CR2032 Li-ion / Approximately 1000 hours continuous use |
| Auto-Off |
Selectable |
| Display |
Large LCD with stability indicator and battery icon |
| Dimensions |
Compact pocket-sized design |
| Weight |
14 oz (with electrode and battery) |
What's Included
- HI98100 Checker® Plus pH tester
- HI1271 replaceable pH electrode
- pH 4.01 buffer solution sachets (2)
- pH 7.01 buffer solution sachets (2)
- Electrode cleaning solution sachet
- Electrode storage solution
- CR2032 Li-ion battery
- Instruction manual
Electrode Care & Maintenance
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Storage: Always store electrode in the provided storage solution to keep the glass membrane hydrated
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Cleaning: Clean electrode regularly with the provided cleaning solution to remove buildup and maintain response time
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Calibration: Calibrate regularly using fresh buffer solutions for optimal accuracy
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Replacement: When electrode response becomes slow or readings drift, simply unscrew and replace with a new HI1271 electrode
Replacement Parts & Accessories
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HI1271: Replacement pH electrode
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HI70004P: pH 4.01 buffer solution
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HI70007P: pH 7.01 buffer solution
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HI70300: Storage solution for pH electrodes
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HI700601: Electrode cleaning solution
Why Hanna Instruments?
Hanna Instruments is a global leader in analytical instrumentation with over 40 years of experience. The Checker® Plus line represents Hanna's commitment to making professional-grade testing accessible and affordable. Trusted by professionals in over 140 countries, Hanna delivers accuracy you can count on.
Warranty & Support
The HI98100 Checker® Plus is backed by Hanna's quality guarantee and customer support. For technical assistance, calibration questions, or replacement electrode information, contact our expert support team.
