Penlon MRI Green System laryngoscopes are safe to use in MR conditions with a static magnetic field of 1000 gauss/cm or less. Designed for use in the MR environment Safe at the 1000 gauss line Tested in 1.5 and 3.0 Tesla MRI scanners Macintosh, Miller, Robertshaw, Seward and McCoy blade styles Standard size handle High intensity LED light bulb MR-conditional batteries