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
The Oakton pHTestr 30 is the better ph meter overall, rated 3.7 to 3.1. The Oakton pHTestr 30 leads on accuracy, features and price. The Oakton pHTestr 30 costs $43.77 less ($136.22 vs $179.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
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
Which should you buy?
- Choose the Oakton pHTestr 30 for accuracy (±0.01 pH vs ±0.05 pH), features (replaceable probe, automatic temperature compensation, waterproof (IP67) vs replaceable probe, automatic temperature compensation, waterproof) and price ($136.22 vs $179.99).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every pen testers ph meter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Oakton pHTestr 30 | Hanna pHep 5 HI98128 |
|---|---|---|
| Overall rating | 3.7/5 | 3.1/5 |
| Accuracy 30% | 81 ±0.01 pH | 38 ±0.05 pH |
| Calibration 15% | 85 3-point calibration | 85 3-point calibration |
| Features 20% | 80 replaceable probe, automatic temperature compensation, waterproof (IP67) | 70 replaceable probe, automatic temperature compensation, waterproof |
| Extra readings 10% | 0 pH and temperature only | 0 pH and temperature only |
| Price 15% | 64 $136.22 | 52 $179.99 |
| Warranty 10% | 0 warranty not published, scored as none | 0 1-year meter warranty |
Specifications
| Oakton pHTestr 30 | Hanna pHep 5 HI98128 | |
|---|---|---|
| pH measurement | ||
| Accuracy | ±0.01 pH | ±0.05 pH |
| Resolution | 0.01 pH | 0.01 pH |
| Range | -1 to 15 pH | -2 to 16 pH |
| Calibration | 3-point | 3-point |
| Temperature compensation | Yes | Yes |
| Other readings | ||
| Conductivity (EC/TDS) | No | No |
| ORP | No | No |
| Salinity | No | No |
| Build | ||
| Replaceable probe | Yes | Yes |
| Waterproof rating | IP67 | Waterproof |
| Battery life | 500 hours | 300 hours |
| Weight | 90 g | 100 g |
| Meter warranty | - | 1 year |