The award winning Reichert Tono-Pen AVIA tonometer is an easy to use, hand-held instrument that provides IOP readings that correlate strongly with Goldmann tonometry. Tono-Pen AVIA has a lightweight, ergonomic design and advanced electronic measurement technology that enables operators to take fast and accurate IOP measurements with minimal training. Tono-Pen AVIA is powered by a long-life Tono-Pen AVIA POWERCEL battery pack, good for over 2,500 measurements. Tono-Pen AVIA, like the Tono-Pen XL, uses sanitized Ocu-Film tip covers to minimize the risk of patient cross contamination.