Pulse OximetersUpdated June 2026

Masimo MightySat Rx

During an asthma attack, peripheral vasoconstriction and rapid breathing can cause standard pulse oximeters to produce unreliable readings. The Masimo MightySat's SET technology is specifically designed to maintain accuracy during motion, poor perfusion, and respiratory compromise — the exact conditions present duri…

FDA ClearedConnected
Reviewed by
HealthRankings editors
Evidence
Limited
Overall score9.6/10Excellent
Price$199Premium
HSA / FSALikely Eligible
EvidenceLimited
Quick take

What we loved& what to know.

Strengths

  • SET technology — accurate during respiratory compromise
  • Customizable SpO₂ alarm threshold
  • Respiration rate — additional asthma data
  • Bluetooth trending for physician review
  • Accurate during motion (breathing effort)
  • FDA Class II cleared
  • Premium price ($199)
  • Requires app for full features

Tradeoffs

  • Premium price ($199)
  • Requires app for full features
Real-world usage

Living with the Masimo MightySat Rx.

Practical considerations for daily operation.

Daily routine

Designed to slot into a typical morning health-check routine without friction.

Learning curve

Plan a short learning curve to get a feel for the device's prompts and ideal positioning.

Maintenance

Keep the unit clean and store it in a dry case to preserve accuracy long-term.

Portability

Best kept on a counter or shelf at home; not engineered for daily commuting.

Manual / offline use

App access unlocks history and trend tracking, but on-device readouts cover daily use.

Hands-on notes

Deep dives.

At a Glance

During an asthma attack, peripheral vasoconstriction and rapid breathing can cause standard pulse oximeters to produce unreliable readings. The Masimo MightySat's SET technology is specifically designed to maintain accuracy during motion, poor perfusion, and respiratory compromise — the exact conditions present during an asthma attack. Customizable SpO₂ alarm (set your personal threshold) alerts you before dangerous desaturation occurs. Respiration rate measurement provides additional clinical data. FDA Class II cleared.

How it stacks up

Pulse Oximeters ranked.

The Masimo MightySat Rx alongside our top picks in pulse oximeters.

RankDeviceScore
#1
Masimo MightySat RxYou’re reading
9.6/10Current
#2
Nonin Model 3230
9.4/10Compare →
#3
Wellue O2Ring Gen 2
9.0/10Compare →
#4
Oxiline Pulse XS Pro
8.8/10Compare →
#5
Zacurate Pro Series 500DL
8.2/10Compare →
9.6/10
Excellent
HealthRankings verdict

The bottom line

During an asthma attack, peripheral vasoconstriction and rapid breathing can cause standard pulse oximeters to produce unreliable readings. The Masimo MightySat's SET technology is specifically designed to maintain accuracy during motion, poor perfusion, and respiratory compromise — the exact conditions present during an asthma attack. Customizable SpO₂ alarm (set your personal threshold) alerts you before dangerous desaturation occurs. Respiration rate measurement provides additional clinical data. FDA Class II cleared.

How we test

HealthRankings buys, tests, and rates devices independently. Our scoring blends quantitative measurements (accuracy vs reference, sample-to-sample variability, fit testing) with everyday usability and cost. We disclose affiliate links and never accept paid placement in our rankings.

Medical disclaimer:Reviews are for general information only and are not medical advice. Always follow your clinician's guidance for diagnosing or treating health conditions. Read full disclaimer