Apera PC60 pH/EC Tester
#1 in Pen testersFull review
A pen that checks pH and nutrient strength together, for hydroponic growers and reef keepers. It is accurate and the probe can be replaced.
Amazon $131.16$131.16
±0.01 pH3-pointEC/TDS, Salinity
3.9/5
The pick for most people who want an accurate pen tester: ±0.01 pH, three-point calibration and a replaceable probe at pen-tester money.
- ±0.01 pHAccuracy
- 3-pointCalibration
- IP67Waterproof
- YesReplaceable probe
Check price at Amazon$79.99
Price checked November 8, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Lab-grade ±0.01 pH accuracy for under $100
- Swap in a new probe when the old one wears out instead of buying a new pen
- IP67 housing floats if it is dropped
Cons
- Measures pH and temperature only
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 | AI311 |
|---|---|
| pH measurement | |
| Accuracy | ±0.01 pH |
| Resolution | 0.01 pH |
| Range | -2 to 16 pH |
| Calibration | 3-point |
| Temperature compensation | Yes |
| Other readings | |
| Conductivity (EC/TDS) | No |
| ORP | No |
| Salinity | No |
| Build | |
| Replaceable probe | Yes |
| Waterproof rating | IP67 |
| Battery life | 2,000 hours |
| Weight | 133 g |
| Meter warranty | 2 years |
| Probe warranty | 6 months |
Alternatives in this type
Oakton pHTestr 30
#3 in Pen testersFull review
A lab-brand pocket tester with a replaceable module, for labs and schools that already stock Oakton parts.
Amazon $136.22$136.22
±0.01 pH3-pointNone
VIVOSUN AeroLab pH Pen
#4 in Pen testersFull review
A low-cost grower’s pen with a replaceable probe. Its maker publishes little beyond the accuracy claim.
Amazon $65.99$65.99
±0.01 pHNone
Compare
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