The global medical industry incorporates thousands of lasers into its arsenal of treatment tools. Wavelengths from UV to Far-infrared are used for everything from Lasik eye surgery to cosmetic skin resurfacing. Visible wavelengths are used in dermatology and ophthalmology to target selective complementary color chromophores. Laser powers and energies are delivered through a wide range of fiber diameters, articulated arms, focusing handpieces, scanners, micromanipulators and more. With all these variables, medical laser service personnel are faced with multiple measurement obstacles. At the Laser Training Institute (lasertraining.org), with headquarters in Columbus Ohio, we offer a week-long laser service school to medical service personnel. Four times a year, a new class will learn the fundamental concepts of power and energy densities, absorption, optics and most of all how lasers work. With a nice sampling of all the major types of medical lasers, the students learn hands-on calibration, alignment and multiple service skills.