Keeler's Tonomate tonometer prisms are sterile, individually packaged, and disposable. Sterile Single-Use design reduces the risk of infection between patients and protects them from diseases that are transmitted through tear film. Tonomate dispossable tonometer prisms fit most manufacturers applanation tonometers. Save time by eliminating the need to sterilize standard contact prisms prior to each procedure. Keeler Tonomate Disposalbe Tonometer Prisms are 30mm in length and are supplied in boxes of 100. Factory part number 2414-P-7039.