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Bluelab
Bluelab pH Pen
$99Cheaper
Best Ph Meters · head-to-head
Bluelab pH Pen vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe
A sourced, side-by-side comparison. Bluelab pH Pen is cheaper at $99. Every spec and price links to its source.
Atlas Scientific
Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe
$174.99
Which is better: the Bluelab pH Pen or Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe?
On the specs we track, they're closely matched. The Bluelab pH Pen is the cheaper at $99.
See Bluelab pH Pen on Amazon See Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe on Amazon
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 | Bluelab pH Pen | Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe |
|---|---|---|
| US price | $99 | $174.99 |
| Brand | Bluelab | Atlas Scientific |
| Released | — | — |
| Ph range | 0.0 to 14.0 | 0 to 14 pH |
| Resolution ph | 0.1 | 0.001 pH |
| Accuracy ph | ±0.1 at 25°C/77°F | ±0.002 pH (probe reading accuracy) |
| Calibration points | Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder | Up to 3-point; kit includes 6x 20ml calibration solution pouches (2x pH 4, 2x pH 7, 2x pH 10) |
| Atc | Yes, fully temperature compensated | — |
| Electrode type | Double-junction pH probe | Double-junction Ag/AgCl Gen 3 Lab Grade pH probe (BNC connection to EZO pH circuit board) |
| Waterproof rating | Waterproof; floats in any solution | — |
| Battery type | 1 x AAA alkaline | None — EZO circuit is powered by the host carrier/development board, no internal battery |
Sources — Bluelab pH Pen: bluelab.com (verified 2026-08-12). Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe: atlas-scientific.com (verified 2026-08-12).
What's the difference between the Bluelab pH Pen and Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe?
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 Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0 to 14 pH
- Resolution ph: Bluelab pH Pen 0.1 vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0.001 pH
- Accuracy ph: Bluelab pH Pen ±0.1 at 25°C/77°F vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe ±0.002 pH (probe reading accuracy)
- Calibration points: Bluelab pH Pen Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder vs 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)
- Electrode type: Bluelab pH Pen Double-junction pH probe vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe Double-junction Ag/AgCl Gen 3 Lab Grade pH probe (BNC connection to EZO pH circuit board)
- Battery type: Bluelab pH Pen 1 x AAA alkaline vs 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