Masimo W1^®

Daily Monitoring

We recommend cleaning your Masimo W1 frequently to remove any dirt or debris that may build up during daily wear.

To clean your Masimo W1, use a soft-bristle, nylon brush to gently brush along the grooves and crevices of the watch and band to loosen debris before cleaning. Wipe surfaces with a gauze pad saturated with 70% isopropyl alcohol until your Masimo W1 is free of residue.

Do not immerse your Masimo W1 in any liquid.

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).

Activity (Steps)
The level of physical activity captured due to motion, represented in steps count.

Heart rate (HR)
The number of times the heart beats in a minute, based on electrical signals.

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

User Interface

Watch Face

Displays Date, Time, SpO₂, Pulse Rate, Daily Step Count and other health data depending on watch face selection.
Health data readings will turn red if values fall outside of normal ranges.

Main Menu

Displays a list of your settings.
Open any setting by tapping on its icon.

Continuous Health Data

Select the Vitals Measurement icon Image from the Main Menu to activate continuous measurement tracking.

Watch Status

Swipe down from the top edge of the watch face to check status of battery, Bluetooth^® connection, the fit of the watch band, and other settings.

Strap Status

Swipe down from the top edge of the watch face and select the watch strap icon to determine if your watch strap is properly fitted to your wrist.
Wearing your watch too loose or too tight can impact the accuracy of heath data readings.