Ohaus Starter ST300
A handheld from a lab-equipment maker, for labs standardised on Ohaus. Other buyers get the same accuracy for less.
Amazon $455.32$455.32
±0.01 pH3-pointNone
2.4/5
A basic cabled meter for rough checks. Most buyers get better accuracy for less from a pen tester.
- ±0.2 pHAccuracy
- 2-pointCalibration
- NoWaterproof
- YesReplaceable probe
Check price at Amazon$158.70
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Standard cabled electrode is easy to replace
Cons
- ±0.2 pH and no temperature compensation
- Manual calibration with trim screws
- Costs more than far more accurate pens
The Milwaukee PRO portable meters family
Every Milwaukee PRO portable meters model we rank, smallest first. Ratings compare each against its own type.
| Model | Accuracy | Rating | Price |
|---|---|---|---|
| Milwaukee MW100 Pro (this one) | ±0.2 pH | 2.4/5 | $158.70 |
| Milwaukee MW102 Pro | ±0.02 pH | 3.1/5 | $195.20 |
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 | MW100 |
|---|---|
| pH measurement | |
| Accuracy | ±0.2 pH |
| Resolution | 0.1 pH |
| Range | 0 to 14 pH |
| Calibration | 2-point |
| Temperature compensation | No |
| Other readings | |
| Conductivity (EC/TDS) | No |
| ORP | No |
| Salinity | No |
| Build | |
| Replaceable probe | Yes |
| Waterproof rating | No |
| Battery life | 300 hours |
| Weight | 227 g |
| Meter warranty | 2 years |
| Probe warranty | 6 months |
Alternatives in this type
Milwaukee MW102 Pro
A no-fuss handheld for brewing, food and hobby labs. It has a standard cabled electrode and a separate temperature probe.
Amazon $195.20$195.20
±0.02 pH2-pointNone
Bluelab Combo Meter
A grower’s meter for checking pH and nutrient strength in reservoirs. It has the longest warranty here.
Amazon $279.99$279.99
±0.1 pH2-pointEC/TDS
Compare
Compare the Milwaukee MW100 Pro with any other ph meter →
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