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VSI 101s Lensometer The VSI 101s, lensometer, is well suited for measuring soft and hard contact lenses as well as conventional spectacle lenses. The VSI 101s lensometer is a compact deluxe model with a full 90-degree inclination, which facilitates the measurement of contact lenses when used in the vertical position. Standard equipment on the 101s includes such deluxe features as a prism compensator, external power and axis readings, and an American-style cross-line target. The over-sized lens table permits the measurement of conventional lenses from 30 to 90 mm in diameter. The instrument is well suited for laboratory or office use.