Product Description
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
Replaceable electrode – HI1271 tapered electrode extends tester life indefinitely with simple screw-on replacement
±0.2 pH accuracy – Professional-grade precision for reliable results
Exceptional battery life – Up to 1000 hours continuous use with CR2032 Li-ion battery
Automatic calibration – One or two-point auto calibration with buffer recognition
Stability indicator – On-screen icon ensures confident, stable readings
Compact & portable – Pocket-sized design perfect for on-the-go testing
Complete starter kit – Includes electrode, buffers, cleaning solution, storage solution, and battery
Selectable auto-off – Conserves battery life if accidentally left on
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:
Tapered design: 103 mm long, tapering to 8 mm diameter at the sensing end
Perfect for small containers: Easily fits into test tubes, vials, and narrow-mouth bottles
Plastic body: Durable construction significantly reduces maintenance requirements
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
Storage: Always store electrode in the provided storage solution to keep the glass membrane hydrated
Cleaning: Clean electrode regularly with the provided cleaning solution to remove buildup and maintain response time
Calibration: Calibrate regularly using fresh buffer solutions for optimal accuracy
Replacement: When electrode response becomes slow or readings drift, simply unscrew and replace with a new HI1271 electrode
Replacement Parts & Accessories
HI1271: Replacement pH electrode
HI70004P: pH 4.01 buffer solution
HI70007P: pH 7.01 buffer solution
HI70300: Storage solution for pH electrodes
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.
