Nonin Medical
Nonin Onyx Vantage 9590
$199
Best Pulse Oximeters · head-to-head
Nonin Onyx Vantage 9590 vs iHealth Air PO3M
A sourced, side-by-side comparison. iHealth Air PO3M is cheaper at $69.99. Every spec and price links to its source.
iHealth Labs
iHealth Air PO3M
$69.99Cheaper
Which is better: the Nonin Onyx Vantage 9590 or iHealth Air PO3M?
On the specs we track, they're closely matched. The iHealth Air PO3M is the cheaper at $69.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Nonin Onyx Vantage 9590 | iHealth Air PO3M |
|---|---|---|
| US price | $199 | $69.99 |
| Brand | Nonin Medical | iHealth Labs |
| Released | — | — |
| Spo2 range | 0-100% | 70-99% |
| Spo2 accuracy percent | 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%) | ±2% (70-99%) |
| Pulse rate range bpm | 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion) | 30-250 bpm |
| Display type | Numeric LED display with tricolor pulse-quality indicator | Bright LED numeric display |
| Perfusion index | No | — |
| Continuous monitoring | No | No |
| Bluetooth | No | Yes |
| Battery life hr | 36 | — |
Sources — Nonin Onyx Vantage 9590: nonin.com (verified 2026-08-01). iHealth Air PO3M: support.ihealthlabs.com (verified 2026-08-01).
What's the difference between the Nonin Onyx Vantage 9590 and iHealth Air PO3M?
Where the two actually differ on the specs we track (5 of 8). Matching specs are omitted.
- Spo2 range: Nonin Onyx Vantage 9590 0-100% vs iHealth Air PO3M 70-99%
- Spo2 accuracy percent: Nonin Onyx Vantage 9590 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%) vs iHealth Air PO3M ±2% (70-99%)
- Pulse rate range bpm: Nonin Onyx Vantage 9590 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion) vs iHealth Air PO3M 30-250 bpm
- Display type: Nonin Onyx Vantage 9590 Numeric LED display with tricolor pulse-quality indicator vs iHealth Air PO3M Bright LED numeric display
- Bluetooth: Nonin Onyx Vantage 9590 false vs iHealth Air PO3M true