What the Hanna HI98118 Fixes About Pocket pH Pens
Pens die at the junction. The reference junction is the electrical path between the internal cell and your solution. Once it clogs, the readings wander and take an age to settle. This one is a cloth junction you can pull. Draw out about 1/8 in and a clean surface is exposed.
Running a Hydroponic pH Tester Day to Day
Two buttons do everything. One is power. The other calibrates automatically at one or two points on pH 4.01, 7.01 and 10.01. A single point in Hanna's Quick Cal solution at 6.86 also works. A third button inside the battery compartment sets your preferences: Celsius or Fahrenheit, and auto-off at 8 minutes, 60 minutes or disabled. Range is 0.00 to 14.00 pH at 0.01 resolution to ±0.1, with automatic temperature compensation. Battery life is the standout at roughly 1,000 hours on one CR2032, and the percentage shows at start-up. The body is 0.7 in thick at 65 g. The junction is about an inch long overall, so pull it sparingly rather than every week.
Key Features
- Extractable cloth junction: Pull out 1/8 in to expose a clean surface when readings start to wander.
- About 1,000 hours on a CR2032: Battery percentage shows at start-up, with a low warning under 10%.
- Two button operation: Power, and automatic one or two point calibration. Nothing else to learn.
- Quick Cal or standard buffers: 6.86 Quick Cal, or 4.01, 7.01 and 10.01 the traditional way.
- 0.00 to 14.00 pH, ±0.1: 0.01 resolution, temperature compensated from a built-in sensor.
- 0.7 in thick at 65 g: Waterproof, with C or F and auto-off set from inside the battery bay.
Technical Specifications
| Specification | Value |
|---|---|
| Model | HI98118 |
| Type | Waterproof pocket pH tester |
| pH Range | 0.00 to 14.00 pH |
| pH Resolution | 0.01 pH |
| pH Accuracy | ±0.1 pH |
| pH Calibration | Automatic, one or two point |
| Standard Buffers | 4.01, 7.01, 10.01 |
| Quick Cal | Single point at pH 6.86 |
| Junction | Extractable cloth, about 1 in overall |
| Temperature Range | 0.0 to 50.0 C, 32.0 to 122.0 F |
| Temperature Resolution | 0.1 C, 0.1 F |
| Temperature Accuracy | ±0.5 C, ±1 F |
| Temperature Compensation | Automatic, 0 to 50 C |
| Battery | CR2032 x 1 |
| Battery Life | About 1,000 hours continuous |
| Auto-Off | 8 minutes, 60 minutes or disabled |
| Units | Celsius or Fahrenheit, selectable |
| Dimensions | 160 x 40 x 17 mm, 6.3 x 1.6 x 0.7 in |
| Weight | 65 g, 2.3 oz |
| Warranty | 1 year, probe 6 months |