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Extech Instruments
Extech PH100 ExStik II Waterproof pH Meter
$124
Best Ph Meters · head-to-head
Extech PH100 ExStik II Waterproof pH Meter 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 Extech PH100 ExStik II Waterproof pH Meter 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 Extech PH100 ExStik II Waterproof pH Meter 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 | Extech PH100 ExStik II Waterproof pH Meter | VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics |
|---|---|---|
| US price | $124 | $8.55 |
| Brand | Extech Instruments | VIVOSUN |
| Released | — | — |
| Ph range | 0.00 to 14.00 pH | 0.00 to 14.00 |
| Resolution ph | 0.01 pH | 0.01 pH |
| Accuracy ph | ±0.01 pH | ±0.01 pH |
| Calibration points | — | 3-point (calibration buffer powders included) |
| Atc | Yes, automatic | Yes |
| Electrode type | Flat-surface electrode (rated for liquids, semi-solids, and solids) | — |
| Waterproof rating | IP57 | — |
| Battery type | 4 x CR2032 3V button cell | 2 x 1.5V button cell (built-in) |
Sources — Extech PH100 ExStik II Waterproof pH Meter: extech.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 Extech PH100 ExStik II Waterproof pH Meter and VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- Ph range: Extech PH100 ExStik II Waterproof pH Meter 0.00 to 14.00 pH vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.00 to 14.00
- Atc: Extech PH100 ExStik II Waterproof pH Meter Yes, automatic vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics Yes
- Battery type: Extech PH100 ExStik II Waterproof pH Meter 4 x CR2032 3V button cell vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 2 x 1.5V button cell (built-in)