Hanna pHep 5 HI98128
#10 in Pen testersFull review
A well-made pocket tester from a lab brand, for anyone who already uses Hanna buffers and electrodes. The Apera PH60 does more for less.
Amazon $179.99$179.99
±0.05 pH3-pointNone
3.0/5
The Bluelab pH Pen with a replaceable probe and a longer warranty, for growers who want a pen that lasts. Pick the Apera PH60 if you need finer resolution.
- ±0.1 pHAccuracy
- 2-pointCalibration
- IP68Waterproof
- YesReplaceable probe
Check price at Amazon$115
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- IP68 housing shrugs off drops into mixing tanks
- Replaceable probe means a worn sensor doesn’t retire the pen
- 30-day calibration reminder on a backlit screen
Cons
- Reads to 0.1 pH only
- Two-point calibration only
The Bluelab pH Pen family
Every Bluelab pH Pen model we rank, smallest first. Ratings compare each against its own type.
| Model | Accuracy | Rating | Price |
|---|---|---|---|
| Bluelab pH Pen | ±0.1 pH | 2.7/5 | $89.95 |
| Bluelab pH PenPlus (this one) | ±0.1 pH | 3.0/5 | $115 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | PENPLUSPH |
|---|---|
| pH measurement | |
| Accuracy | ±0.1 pH |
| Resolution | 0.1 pH |
| Range | 0 to 14 pH |
| Calibration | 2-point |
| Temperature compensation | Yes |
| Other readings | |
| Conductivity (EC/TDS) | No |
| ORP | No |
| Salinity | No |
| Build | |
| Replaceable probe | Yes |
| Waterproof rating | IP68 |
| Meter warranty | 2 years |
| Probe warranty | 6 months |
Alternatives in this type
Milwaukee pH55 Pro
#11 in Pen testersFull review
A low-cost pen with a replaceable electrode, for pools, gardens and aquariums. The Apera PH60 is more accurate for a little more.
Amazon $77.90$77.90
±0.1 pH2-pointNone
Bluelab pH Pen
#13 in Pen testersFull review
A simple, tough pen for growers checking nutrient pH. The PenPlus costs a little more and adds a replaceable probe.
Amazon $89.95$89.95
±0.1 pH2-pointNone
Compare
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