Applications where the quantity of material is very small require a more powerful IR emitter to generate enough visible light for the naked eye to see. For these situations, the PTL range of Infrared Laser Pens can provide the necessary power in a conveniently sized device.
Two AAA batteries power the laser diode generating a defocused infrared beam. A clear plastic shield allows the operator to place the pen against the material to be excited while still being able to view the results. A simple button operates the device, and a built in LED informs the user when the device is on.