The Model 1 Lensometer features an American Style cross-line target, a prism compensator, an external measurement wheel, and variable inclination up to 90 degrees for easy operation. Designed to last, the S4OPTIK Model-1 lensmeter is perfect for any office even in high volume laboratories. Prism compensator External measurement wheel Magnifier for easy to read axis values Variable inclination up to 90 degrees Perfect for laboratory use Durable construction