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
The Bluelab Combo Meter is the better ph meter overall, rated 3.1 to 2.4. The Bluelab Combo Meter leads on warranty, extra readings and accuracy. The Milwaukee MW100 Pro wins on price. The Milwaukee MW100 Pro costs $121.29 less ($158.70 vs $279.99).
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.
Milwaukee MW100 Pro
A basic cabled meter for rough checks. Most buyers get better accuracy for less from a pen tester.
Amazon $158.70$158.70
Which should you buy?
- Choose the Bluelab Combo Meter for warranty (5-year meter warranty vs 2-year meter warranty), extra readings (conductivity (EC/TDS) vs pH and temperature only) and accuracy (±0.1 pH vs ±0.2 pH).
- Choose the Milwaukee MW100 Pro for price ($158.70 vs $279.99).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every portable meters ph meter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Bluelab Combo Meter | Milwaukee MW100 Pro |
|---|---|---|
| Overall rating | 3.1/5 | 2.4/5 |
| Accuracy 30% | 19 ±0.1 pH | 0 ±0.2 pH |
| Calibration 15% | 50 2-point calibration | 50 2-point calibration |
| Features 20% | 55 replaceable probe, automatic temperature compensation | 30 replaceable probe |
| Extra readings 10% | 70 conductivity (EC/TDS) | 0 pH and temperature only |
| Price 15% | 33 $279.99 | 58 $158.70 |
| Warranty 10% | 100 5-year meter warranty | 25 2-year meter warranty |
Specifications
| Bluelab Combo Meter | Milwaukee MW100 Pro | |
|---|---|---|
| pH measurement | ||
| Accuracy | ±0.1 pH | ±0.2 pH |
| Resolution | 0.1 pH | 0.1 pH |
| Range | 0 to 14 pH | 0 to 14 pH |
| Calibration | 2-point | 2-point |
| Temperature compensation | Yes | No |
| Other readings | ||
| Conductivity (EC/TDS) | Yes | No |
| ORP | No | No |
| Salinity | No | No |
| Build | ||
| Replaceable probe | Yes | Yes |
| Waterproof rating | - | No |
| Battery life | - | 300 hours |
| Weight | - | 227 g |
| Meter warranty | 5 years | 2 years |
| Probe warranty | 6 months | 6 months |