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Bluelab
Bluelab pH Pen
$99
Best Ph Meters · head-to-head
Bluelab pH Pen vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics
A sourced, side-by-side comparison. VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics is cheaper at $8.55. Every spec and price links to its source.
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VIVOSUN
VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics
$8.55Cheaper
Which is better: the Bluelab pH Pen or VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics?
On the specs we track, they're closely matched. The VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics is the cheaper at $8.55.
See Bluelab pH Pen on Amazon Check VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics price
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Bluelab pH Pen | VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics |
|---|---|---|
| US price | $99 | $8.55 |
| Brand | Bluelab | VIVOSUN |
| Released | — | — |
| Ph range | 0.0 to 14.0 | 0.00 to 14.00 |
| Resolution ph | 0.1 | 0.01 pH |
| Accuracy ph | ±0.1 at 25°C/77°F | ±0.01 pH |
| Calibration points | Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder | 3-point (calibration buffer powders included) |
| Atc | Yes, fully temperature compensated | Yes |
| Electrode type | Double-junction pH probe | — |
| Waterproof rating | Waterproof; floats in any solution | — |
| Battery type | 1 x AAA alkaline | 2 x 1.5V button cell (built-in) |
Sources — Bluelab pH Pen: bluelab.com (verified 2026-08-12). VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: amazon.com (verified 2026-08-12).
What's the difference between the Bluelab pH Pen and VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics?
Where the two actually differ on the specs we track (6 of 8). Matching specs are omitted.
- Ph range: Bluelab pH Pen 0.0 to 14.0 vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.00 to 14.00
- Resolution ph: Bluelab pH Pen 0.1 vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.01 pH
- Accuracy ph: Bluelab pH Pen ±0.1 at 25°C/77°F vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ±0.01 pH
- Calibration points: Bluelab pH Pen Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 3-point (calibration buffer powders included)
- Atc: Bluelab pH Pen Yes, fully temperature compensated vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics Yes
- Battery type: Bluelab pH Pen 1 x AAA alkaline vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 2 x 1.5V button cell (built-in)