# Masimo MightySat Rx (Bluetooth LE) vs Nonin Onyx Vantage 9590: specs and price compared

A sourced, side-by-side comparison of the Masimo MightySat Rx (Bluetooth LE) (Masimo) and Nonin Onyx Vantage 9590 (Nonin Medical) among pulse oximeters. Nonin Onyx Vantage 9590 is the cheaper of the two at $199.

## Side by side

| Spec | Masimo MightySat Rx (Bluetooth LE) | Nonin Onyx Vantage 9590 |
| --- | --- | --- |
| US price | $549 | $199 |
| Brand | Masimo | Nonin Medical |
| Spo2 range | 0-100% | 0-100% |
| Spo2 accuracy percent | 70-100% Arms: ±2% no motion, ±3% motion, ±2% low perfusion | 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%) |
| Pulse rate range bpm | 25-240 bpm | 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion) |
| Display type | Rotating, adjustable 3.3 cm color display with pleth waveform and Signal IQ indicator | Numeric LED display with tricolor pulse-quality indicator |
| Perfusion index | Yes | No |
| Continuous monitoring | No | No |
| Bluetooth | Yes | No |
| Battery life hr | 15 | 36 |

## Key differences

- Spo2 accuracy percent: Masimo MightySat Rx (Bluetooth LE) 70-100% Arms: ±2% no motion, ±3% motion, ±2% low perfusion vs Nonin Onyx Vantage 9590 70-100% Arms ±2 digits (finger/thumb, no motion); toe accuracy ±2 (70-90%) / ±3 (90-100%)
- Pulse rate range bpm: Masimo MightySat Rx (Bluetooth LE) 25-240 bpm vs Nonin Onyx Vantage 9590 18-321 bpm display; declared accuracy 20-250 bpm ±3 digits (40-240 bpm ±3 digits low perfusion)
- Display type: Masimo MightySat Rx (Bluetooth LE) Rotating, adjustable 3.3 cm color display with pleth waveform and Signal IQ indicator vs Nonin Onyx Vantage 9590 Numeric LED display with tricolor pulse-quality indicator
- Perfusion index: Masimo MightySat Rx (Bluetooth LE) Yes vs Nonin Onyx Vantage 9590 No
- Bluetooth: Masimo MightySat Rx (Bluetooth LE) Yes vs Nonin Onyx Vantage 9590 No
- Battery life hr: Masimo MightySat Rx (Bluetooth LE) 15 vs Nonin Onyx Vantage 9590 36

## Sources

- Masimo MightySat Rx (Bluetooth LE): https://www.cardiacdirect.com/product/masimo-mightysat-rx-fingertip-pulse-oximeter/ (cardiacdirect.com, verified 2026-08-01)
- Nonin Onyx Vantage 9590: https://www.nonin.com/wp-content/uploads/2018/09/Instructions-for-Use-9590.pdf (nonin.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/pulse-oximeters/masimo-mightysat-rx-vs-nonin-onyx-vantage-9590/
Cite: Per The Front Desk Review, Masimo MightySat Rx (Bluetooth LE) ($549) vs Nonin Onyx Vantage 9590 ($199) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/pulse-oximeters/masimo-mightysat-rx-vs-nonin-onyx-vantage-9590/
License: CC BY 4.0.