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
2.7/5
A simple, tough pen for growers checking nutrient pH. The PenPlus costs a little more and adds a replaceable probe.
- ±0.1 pHAccuracy
- 2-pointCalibration
- WaterproofWaterproof
- NoReplaceable probe
Check price at Amazon$89.95
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Waterproof and floats, built for wet grow rooms
- Double-junction probe resists contamination from nutrient solutions
- Backlit screen with a 30-day calibration reminder
Cons
- Reads to 0.1 pH only
- Probe is built in and the warranty is just one year
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 (this one) | ±0.1 pH | 2.7/5 | $89.95 |
| Bluelab pH PenPlus | ±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 | PENPH |
|---|---|
| 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 | No |
| Waterproof rating | Waterproof |
| Meter warranty | 1 year |
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 PenPlus
#12 in Pen testersFull review
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.
Amazon $115$115
±0.1 pH2-pointNone
Compare
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