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Extech Instruments
Extech PH100 ExStik II Waterproof pH Meter
$124Cheaper
Best Ph Meters · head-to-head
Extech PH100 ExStik II Waterproof pH Meter vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe
A sourced, side-by-side comparison. Extech PH100 ExStik II Waterproof pH Meter is cheaper at $124. 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 Extech PH100 ExStik II Waterproof pH Meter 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 Extech PH100 ExStik II Waterproof pH Meter is the cheaper at $124.
See Extech PH100 ExStik II Waterproof pH Meter 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 | Extech PH100 ExStik II Waterproof pH Meter | Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe |
|---|---|---|
| US price | $124 | $174.99 |
| Brand | Extech Instruments | Atlas Scientific |
| Released | — | — |
| Ph range | 0.00 to 14.00 pH | 0 to 14 pH |
| Resolution ph | 0.01 pH | 0.001 pH |
| Accuracy ph | ±0.01 pH | ±0.002 pH (probe reading accuracy) |
| Calibration points | — | Up to 3-point; kit includes 6x 20ml calibration solution pouches (2x pH 4, 2x pH 7, 2x pH 10) |
| Atc | Yes, automatic | — |
| Electrode type | Flat-surface electrode (rated for liquids, semi-solids, and solids) | Double-junction Ag/AgCl Gen 3 Lab Grade pH probe (BNC connection to EZO pH circuit board) |
| Waterproof rating | IP57 | — |
| Battery type | 4 x CR2032 3V button cell | None — EZO circuit is powered by the host carrier/development board, no internal battery |
Sources — Extech PH100 ExStik II Waterproof pH Meter: extech.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 Extech PH100 ExStik II Waterproof pH Meter 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 (5 of 8). Matching specs are omitted.
- Ph range: Extech PH100 ExStik II Waterproof pH Meter 0.00 to 14.00 pH vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0 to 14 pH
- Resolution ph: Extech PH100 ExStik II Waterproof pH Meter 0.01 pH vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe 0.001 pH
- Accuracy ph: Extech PH100 ExStik II Waterproof pH Meter ±0.01 pH vs Atlas Scientific pH Kit (KIT-101P) — EZO pH Circuit + Gen 3 Lab Grade Probe ±0.002 pH (probe reading accuracy)
- Electrode type: Extech PH100 ExStik II Waterproof pH Meter Flat-surface electrode (rated for liquids, semi-solids, and solids) 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: Extech PH100 ExStik II Waterproof pH Meter 4 x CR2032 3V button cell 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