Tono-Vera Tonometer Model:AA Battery here is a work-around option

here is a work-around option that may be useful:

(For precise power mapping

Standard Accessories: Dust Cover

and five legs to distribute weight evenly and ensure stability

Astigmatic Clock

Tono-Vera Tonometer Model:AA Battery here is a work-around optionA more objective measurement with ActiView The Tono Vera ActiView Positioning System features a full color view of the eye combined with intuitive, interactive alignment prompts to guide the user precisely to the apex of the cornea. When proper alignment is achieved Tono Vera automatically measures, providing a result in as few as three measurements. Intuitive color coded rings indicate the reliability of the reading. Lightweight, Ergonomic, and