Hanna Pocket Hanna pH tester
- 12 months limited warranty
- One-button operation
- Replaceable pH electrode
- ±0.2 pH accuracy
The HI98103 Checker pH tester is the next generation of the original Hanna Checker pH tester
The Checker is the most popular pH meter in the world with over 1 million meters used since its introduction in 1991. From students to researchers, the Checker has been helping people with their pH measurement as a meter that is simple to use and operate. The HI98103 Checker pH tester has been designed with many advanced features while maintaining the look and feel of the original Checker. The redesigned Checker 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 an 8 mm diameter making it ideal for test tubes and vials.
HI98103 Checker pH tester -Hanna Instruments
Features at-a-glance:
Economical – The Checker is a full-featured pH tester at a price that anyone that needs to measure pH can afford.
Large LCD - Enhanced LCD that displays the 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 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 exceptionally long battery life of approximately 1000 hours. When the battery power is running low a low battery indicator is displayed. 
QUICK TIP:
Meter Overview
Preparation: The pH electrode is shipped dry. Before using the Checker®, remove the protective cap and condition the electrode by soaking the tip (bottom 4 cm (1.5”)) in pH 7.01 buffer solution for several hours. Then follow the calibration procedure.
• Do not be alarmed if white crystals appear around the cap. This is normal with pH electrodes and they dissolve when rinsed with water.
• Connect the electrode to the meter.
• Turn the Checker® on by pressing ON/OFF button.
• Remove the protective cap and immerse the tip of the electrode in the sample to be tested.
• Stir gently and wait for a stable reading. NEVER IMMERSE THE ELECTRODE OVER THE MAXIMUM IMMERSION LEVEL. THE CONNECTOR MUST ALWAYS BE CLEAN AND DRY.
• After use, rinse the electrode with water and store it with a few drops of HI70300 storage solution in the protective cap.
• Replace protective cap after each use. DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE
Q&A
What is a pocket pH tester?
A pocket pH tester is a compact, portable digital instrument designed to measure the acidity or alkalinity (pH) of liquid samples. These testers are small enough to fit in a pocket and are widely used for on‑site water quality testing, environmental monitoring, aquariums, pools, and other field or lab applications.
What range of pH can a typical pocket pH tester measure?
Most pocket pH testers measure pH over a broad range from approximately 0.0 to 14.0 pH, covering the full acidity to alkalinity spectrum of most aqueous solutions.
How accurate are pocket pH testers?
The accuracy varies by model. Entry‑level testers may have an accuracy around ±0.1 pH, while higher‑resolution models can offer ±0.01 pH accuracy, providing more precise readings in sensitive applications.
Do pocket pH testers measure temperature too?
Yes, many pocket pH testers include a built‑in temperature sensor and provide automatic temperature compensation (ATC) to improve the accuracy of pH readings as the sample temperature changes.
How are pocket pH testers calibrated?
Pocket pH testers are calibrated using standard pH buffer solutions such as pH 4.01, 7.01, and sometimes 10.01. Calibration may be automatic or manual, depending on the tester model.
Are pocket pH testers waterproof?
Many pocket pH testers are designed with waterproof housings (often IP67 rated), allowing them to withstand splashes, rain, or field conditions without damage.
What are common applications for a pocket pH tester?
Pocket pH testers are used for testing pH in drinking water, environmental water, aquaculture, pools, wastewater, agriculture, horticulture, lab samples, and industrial process water.
Why choose a pocket pH tester over test strips?
Digital pocket pH testers provide objective, numeric readings rather than relying on visual color matching like test strips. This increases accuracy, reduces interpretation errors, and allows more consistent monitoring over time.
| pH Range | 0.0 to 14.0 pH |
|---|---|
| pH Resolution | 0.1 pH |
| pH Accuracy | ±0.2 pH |
| Calibration | Automatic, two points |
| Battery Type/Life | 1.5V CR2032 (1) / approximately 1000 hours of continuous use |
| Electrode/Probe | HI1271 pH electrode with screw type connector (included) |
| Environment | 0 to 50°C (32 to 122°F); RH max 95% |
| Dimensions | 50 x 174 x 21 mm (2 x 6.8 x 0.9”) |
| Weight | 50 g (1.8 oz.) |
| Ordering Information | HI98103 Checker is supplied with HI1271 pH electrode, HI70004 pH 4.01 buffer solution sachets (2 x 20 mL),HI70007 pH 7.01 buffer solution sachets (2 x 20 mL),HI700601 electrode cleaning solution sachets (2 x 20 mL),instruction manual, instrument quality certificate and plastic carrying case. |
| Warranty | 1 year (probe 6 months) |
| Price | $USD 35.00 |
|---|
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