Monitor without interrupting sleep

Hassle-free continuous monitoring, 24/7 for up to 8 days. No need to even wake them.

Alerts to your mobile device

Automatically sends readings to your mobile device and notifies you if temperature is out of range*

Automatic trends

A regular thermometer tells you where your child’s fever is. Masimo Radius T° helps you see which way it’s trending, so you can easily see if the fever is getting better or worse.

Hospital-grade technology

For over 25 years, Clinicians and Pediatricians have trusted Masimo technology to help keep children safe. Now you can bring Masimo into your home.

Hassle-Free Continuous Thermometer

Comfortably worn on chest for up to 8 days
Water resistant – can be worn while showering
Fully disposable after use
Reliable accuracy (± 0.2°F)**
Seamlessly sends data to mobile device via Bluetooth®
Can be used by anyone age 5+

Always at Your Fingertips

With the Masimo Radius T° mobile app, you can easily keep an eye on a fever


See if temperature is in or out of range at a quick glance.


See if the fever is getting better or worse, so you can monitor progress.


Automatically notifies you if the temperature is out-of-range, so you know when additional action may be needed.

Available for Apple iOS and Android devices

Radius T° System Includes:

  • 3 Continuous Temperature Sensors
    (each wearable for up to 8 days & disposable)
  • Setup Instructions
  • Downloadable Masimo Radius T° Mobile App


  • * Mobile device must be within Bluetooth® communication range of temperature sensor
  • ** The laboratory accuracy of Radius T° is ±0.18°F (±0.1°C) for an input surface temperature range of 77°F to 109.4°F (25°C to 43°C).

Radius T° is not FDA 510(k) cleared. The device is marketed under the FDA’s Enforcement Policy for Clinical Electronic Thermometers During COVID-19.