How to Use It
Getting Started

Masimo provides this step-by-step user guide to assist you in the use of the MightySat device.

Set up

  • Download the free Masimo Personal Health App on the App Store or Google Play.
  • Follow the App instructions to sync your MightySat with your smart device.

Listen to your body by quickly and accurately
measuring key physiologic variables.

  • Place the MightySat on the ring finger and wait for the numbers to appear on the display.
  • Tap the square below the screen to rotate the display for your optimal viewing angle
  • Take note of your measurements:

Oxygen Level (SpO2)*Oxygen levels in your blood can change with heart and lung function, activity, and altitude

Pulse Rate (PR)How often the heart pushes blood through your body, which can change with general health, physical activity, and with your mental or emotional state (e.g., stress, anxiety)

Perfusion Index (Pi)A calculation of the relative strength of your pulse, which changes based on your circulation

Monitoring your body

Learn from your body by monitoring yourself in the morning, after exercise, or anytime you want to know what your body is telling you.

Morning monitoring

  • Keep your MightySat at your bedside and each morning monitor yourself before you get out of bed
  • Establish your normal, or “baseline”, values
  • Oxygen Level (SpO2)
    • A fully oxygenated body generally means a fully recovered and ready body. An SpO2 between 97% and 100% means your body is ready!
    • Note: At higher elevation (starting at about 3,000 feet), it is normal for your SpO2 to be 3% to 5% lower. The higher the elevation, the lower your SpO2 will be.
  • Pulse Rate (PR)
    • Your pulse rate changes constantly to provide the necessary blood flow to deliver the oxygen your body needs. Generally, a lower resting pulse rate (40 to 60 beats per minute) means your body is performing more effectively and efficiently.
  • Perfusion Index (Pi)
    • Your perfusion index changes based on whether the blood flow to your body is going up or down, and whether the arteries in your fingers are narrowing (causing your fingers to feel colder) or widening (causing your fingers to feel warmer). There is no specific “normal” value for perfusion index; each person should establish their own baseline value and note how it changes over time. A higher perfusion index means greater blood flow to the finger and a lower perfusion index means lower blood flow to the finger. Your perfusion index may or may not change significantly in the morning or after exercise. Note any changes to your perfusion index and whether you feel any differently when your perfusion index is lower.

After exercise monitoring

  • Keep your MightySat with you when you exercise.
  • Immediately after exercise, measure how long it takes for your measurements to change.
  • Oxygen saturation (SpO2)
    • Measure how long it takes for your oxygen level to return to your baseline value
      (for example, from 95% to 98%).
  • Pulse Rate (PR)
    • Measure how long it takes for your pulse rate to go down by 20 beats per minute (example, from 160 to 140 beats per minute).
FAQs

Pulse oximeters measure light absorption in the finger to noninvasively monitor oxygen saturation and pulse rate. Fingertip pulse oximeters are increasingly used for general wellness and health applications including sports, fitness, and relaxation management. Developed by Masimo, the leading brand of hospital pulse oximeters,¹ the MightySat fingertip pulse oximeter provides accurate blood oxygen saturation and pulse rate measurements when other pulse oximeters fail.

Multiple companies have introduced low-priced, battery-powered “fingertip” pulse oximeters to the consumer market. In some circumstances, these products may provide inaccurate measurements or no measurements at all. This often occurs when there is low blood flow to the finger (such as when the fingers are cold) or during hand movement (even with minimal motion such as shaking). In addition, many of the products on the market are of low quality and do not interface with smartphones to store, manage, and share data.
MightySat is powered by Masimo SET® pulse oximetry—the same technology used to monitor over 250 million patients annually at hospitals around the world.1 MightySat is accurate when other pulse oximeters fail – when in motion, when hands are cold, in direct sunlight, and across all skin pigmentations.

Masimo originally developed Signal Extraction Technology® (SET®) pulse oximetry for clinical use but it is now available for general wellness and health applications including sports, fitness, and relaxation management. Masimo SET® uses five parallel signal processing engines that measure through challenging conditions, including movement and low blood flow.

MightySat can help improve your performance by providing accurate measurements during your training and recovery, which can help you optimize your training schedule and guide your workout intensity and recovery.
MightySat users can track and trend data seamlessly. See patterns and trends through the free Masimo Personal Health App and know when your health values are out of target ranges.

The new heart rate recovery calculator (available on the iOS platform) tracks the heart’s ability to return to normal levels after physical activity.

Fitness level and proper heart function are measured by the recovery phase. A heart that is fit will recover at a quicker rate than a heart that is not accustomed to regular exercise. The first minute of recovery is the most crucial. After exercise, your heart rate experiences an abrupt drop during the first minute. This recovery period can indicate overall cardiovascular fitness level.

The heart rate recovery calculator does all the work for you. Slip the MightySat on your finger right after an exercise session and open the app. On the dropdown menu, select the Heart Rate Recovery option. Press start and let the countdown begin. After 60 seconds, you will receive your score. Watch your fitness improve as you set new goals for your recovery time with each session.

No. MightySat is intended for spot-checking on people who weigh 30kg/66lbs or more.

Yes. Syncing must be authorized in the settings for both apps.

Parameter data can be displayed on a compatible smart device with Bluetooth® LE. For a full list of compatible smart devices, click here. The free Masimo Personal Health App is downloadable from the Apple App Store for iOS devices or Google Play™ store for select Android devices. Please note that a MightySat is required for the App to work.

MightySat works with major smartphone brands (iOS and Android). For phone compatibility, click here.

For any questions or assistance you may need regarding your MightySat, please contact us for product support and customer service.
1Estimate: Masimo data on file
Troubleshooting
Error or Error Message Possible Causes Recommended Solutions
A red battery symbol displays on display screen Low Battery Replace low batteries as soon as possible. (See Installing the AAA Batteries section in this manual)
Device does not display readings Incorrect finger placement

Incorrect battery orientation

No battery

Low battery

Environmental influences		 Wait for measurement (PVi may take up to 2 minutes before initial measurement)

Reposition finger (see Using MightySat®

Rx section in this manual) Re-orient batteries

Replace with new batteries Relocate device

Contact Masimo Technical Services
Device display does not turn on No battery

Device damaged		 No battery

Device damaged
Numbers appear dim Low battery

Brightness set low

Exposed to bright lights or sunlight

Incorrect finger placement

Measurement site may be poorly perfused		 Check battery status indicator and replace batteries if necessary

Check brightness setting in menu

Relocate device so that it is no directly under bright lights

Reposition finger (See Using MightySat Rx section in this manual)

Choose different finger

Contact Masimo Technical Services
Device keeps turning off while on the finger Incorrect finger placement

Environmental influences

Device damaged		 Reposition finger (See Using MightySat Rx section in this manual)

Relocate device

Contact Masimo Technical Services
Measurement does not display on the smart device Bluetooth LE not connected

Compatible App not installed on smart device

Device damaged

Smart device damaged		 Confirm Bluetooth LE is on for the MightySat Rx and the smart device

Confirm the Masimo app is installed on the smart device

Close and re-launch the compatible app on the smart device

Check that MightySat Rx is paired to the correct smart device

Contact Masimo Technical Services
Manuals
MightySat Operator's Manual
Device Compatibility

The Masimo Personal Health App is compatible with most mobile devices.

Android version: Version 2.0.2.0 and later is compatible with Android devices running Android 7 or later.
iOS version: Version 13.0 or later.

* Arterial oxygen saturation
PLCO-006220/PLM-14198A-0922