The Tono-Pen XL applanation tonometer is an easy to use, hand-held instrument that provides IOP readings that correlate closely with Goldmann Tonometry. The Tono-Pen XL tonometer functions in any orientation, making it ideal to use on patients in beds or wheelchairs. The device activates with the push of a button and results are displayed clearly on the easy-to-read LCD screen. Clinicians worldwide have trusted the Tono-Pen XL tonometer for nearly two decades.