Atlas Scientific
Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe
$174.99
Best Ph Meters · head-to-head
Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 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 Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 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 Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe on Amazon Check VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics price
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| 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 |
| Released | — | — |
| 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) |
Sources — Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe: atlas-scientific.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 Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe and VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- 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)