# Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: specs and price compared

A sourced, side-by-side comparison of the Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe (Atlas Scientific) 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 | Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe | VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics |
| --- | --- | --- |
| US price | $174.99 | $8.55 |
| Brand | Atlas Scientific | VIVOSUN |
| Ph range | 0 to 14 pH | 0.00 to 14.00 |
| Resolution ph | 0.001 pH | 0.01 pH |
| Accuracy ph | ±0.002 pH (probe reading accuracy) | ±0.01 pH |
| Calibration points | Up to 3-point; kit includes 6x 20ml calibration solution pouches (2x pH 4, 2x pH 7, 2x pH 10) | 3-point (calibration buffer powders included) |
| Atc | — | Yes |
| Electrode type | Double-junction Ag/AgCl Gen 3 Lab Grade pH probe (BNC connection to EZO pH circuit board) | — |
| Waterproof rating | — | — |
| Battery type | None — EZO circuit is powered by the host carrier/development board, no internal battery | 2 x 1.5V button cell (built-in) |

## Key differences

- Ph range: Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0 to 14 pH vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.00 to 14.00
- Resolution ph: Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0.001 pH vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.01 pH
- Accuracy ph: Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe ±0.002 pH (probe reading accuracy) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ±0.01 pH
- Calibration points: Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe Up to 3-point; kit includes 6x 20ml calibration solution pouches (2x pH 4, 2x pH 7, 2x pH 10) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 3-point (calibration buffer powders included)
- Battery type: Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe None — EZO circuit is powered by the host carrier/development board, no internal battery vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 2 x 1.5V button cell (built-in)

## Sources

- Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe: https://atlas-scientific.com/kits/ph-kit/ (atlas-scientific.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/atlas-scientific-ph-kit-vs-vivosun-ph-meter/
Cite: Per The Front Desk Review, Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe ($174.99) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ($8.55) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/ph-meters/atlas-scientific-ph-kit-vs-vivosun-ph-meter/
License: CC BY 4.0.