# Extech PH100 ExStik II Waterproof pH Meter vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: specs and price compared

A sourced, side-by-side comparison of the Extech PH100 ExStik II Waterproof pH Meter (Extech Instruments) and VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics (VIVOSUN) among ph meters. VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics is the cheaper of the two at $8.55.

## Side by side

| 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 |
| 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) |

## Key differences

- 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)

## Sources

- Extech PH100 ExStik II Waterproof pH Meter: https://www.extech.com/products/PH100 (extech.com, verified 2026-08-12)
- VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: https://www.amazon.com/VIVOSUN-Meter-Digital-Tester-Water/dp/B01M5IASHD/ (amazon.com, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/ph-meters/extech-ph100-vs-vivosun-ph-meter/
Cite: Per The Front Desk Review, Extech PH100 ExStik II Waterproof pH Meter ($124) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ($8.55) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/ph-meters/extech-ph100-vs-vivosun-ph-meter/
License: CC BY 4.0.