The Model ET-3, Electronic Thickness Gauge is a highly specialized instrument, used by contact lens manufacturers and researchers.

The ET-3 is designed to accurately measure the thickness of soft contact lenses and other soft materials. The instruments are built to perform with the highest degree of precision and with the highest degree of reliability possible. The instruments will stay in calibration, and will continue to function in this manner for many years.

The Model 201T Permeometer is the most advanced contact lens Oxygen Polarographic Amplifier system available.

The 201T Permeometer with Rehder SSTS cells is designed to meet the specifications of ISO 9913 and ISO 18369. The 201T Permeometer provides a stable excitation voltage and simultaneously displays cell current and temperature on easy to read 3 1/2 digit displays. The display can be switched between two cell inputs allowing one cell to decay while the other is being read.

Used to measure oxygen transmissibility (Dk/t) of gas permeable hard or soft contact lenses and lens materials.

Designed to operate in conjunction with the 201T Permeometer and the Cell Mounting Fixture. The Dk cells have a 24 karat gold cathode surrounded by a 99.9% silver anode. A sensor embedded in the cell monitors the temperature at the cell surface. The cells are furnished with either a flat or radiused surface (7.5 mm radius or larger).

The Single Lens Apparatus (SLA) requires only a single soft contact lens to ascertain oxygen permeabilities (Dk) of hypertransmissible lenses.

Used in contrast to conventional methods where a range of lens thickness is needed for determining oxygen permeabilities of SCLs. This is accomplished by minimizing (or completely eliminating) edge effects, boundary-layer resistances, and lens desiccation in this polarographic apparatus.