# Masimo MightySat Rx (Bluetooth LE) vs Contec CMS50D: specs and price compared

A sourced, side-by-side comparison of the Masimo MightySat Rx (Bluetooth LE) (Masimo) and Contec CMS50D (Contec Medical Systems) among pulse oximeters. Contec CMS50D is the cheaper of the two at $8.99.

## Side by side

| Spec | Masimo MightySat Rx (Bluetooth LE) | Contec CMS50D |
| --- | --- | --- |
| US price | $549 | $8.99 |
| Brand | Masimo | Contec Medical Systems |
| Spo2 range | 0-100% | 0-100% |
| Spo2 accuracy percent | 70-100% Arms: ±2% no motion, ±3% motion, ±2% low perfusion | ±2% (70-100%); ±4% under weak/low-perfusion signal conditions |
| Pulse rate range bpm | 25-240 bpm | 30-250 bpm |
| Display type | Rotating, adjustable 3.3 cm color display with pleth waveform and Signal IQ indicator | LED display |
| Perfusion index | Yes | No |
| Continuous monitoring | No | No |
| Bluetooth | Yes | No |
| Battery life hr | 15 | 24 |

## Key differences

- Spo2 accuracy percent: Masimo MightySat Rx (Bluetooth LE) 70-100% Arms: ±2% no motion, ±3% motion, ±2% low perfusion vs Contec CMS50D ±2% (70-100%); ±4% under weak/low-perfusion signal conditions
- Pulse rate range bpm: Masimo MightySat Rx (Bluetooth LE) 25-240 bpm vs Contec CMS50D 30-250 bpm
- Display type: Masimo MightySat Rx (Bluetooth LE) Rotating, adjustable 3.3 cm color display with pleth waveform and Signal IQ indicator vs Contec CMS50D LED display
- Perfusion index: Masimo MightySat Rx (Bluetooth LE) Yes vs Contec CMS50D No
- Bluetooth: Masimo MightySat Rx (Bluetooth LE) Yes vs Contec CMS50D No
- Battery life hr: Masimo MightySat Rx (Bluetooth LE) 15 vs Contec CMS50D 24

## Sources

- Masimo MightySat Rx (Bluetooth LE): https://www.cardiacdirect.com/product/masimo-mightysat-rx-fingertip-pulse-oximeter/ (cardiacdirect.com, verified 2026-08-01)
- Contec CMS50D: https://www.contecmedsystems.com/showroom/contec-cms50d-fingertip-pulse-oximeter-spo2-sensor-ce-and-fda-approved.html (contecmedsystems.com, verified 2026-08-01)

Canonical: https://frontdeskreview.com/gear/pulse-oximeters/masimo-mightysat-rx-vs-contec-cms50d/
Cite: Per The Front Desk Review, Masimo MightySat Rx (Bluetooth LE) ($549) vs Contec CMS50D ($8.99) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/pulse-oximeters/masimo-mightysat-rx-vs-contec-cms50d/
License: CC BY 4.0.