The Scott Instruments Dosimeter Badges operates by direct diffusion exposure - no pump or active elements are needed. Badges are lightweight, direct-reading monitors designed to be worn by individuals who are potentially at risk from acutely toxic gases in their working environments. They indicate the presence of these gases by means of a highly specific chemical color reaction in which the amount of color produced is directly proportional to the concentration of gas and the time of exposure.

Badge programs typically require a minimum of administrative and maintenance effort. Badges are individually sealed, numbered and dated and can be easily distributed from convenient locations around the facility. A new badge is issued to each employee at the beginning of each shift and simply disposed of if not stain develops. Each badge serves to record an individuals daily exposure. This contributes to a comprehensive worker history.

A Dose Estimator (color wheel) is a convenient, pocket sized color comparator using color wheels and a viewing window to allow rapid color matching. It is simple to use and has the operating instructions printed on it. The dosimeter is held in place behind the dose estimator so that a window overlays the stained area on the dosimeter badge. The color wheel is rotated until the color segment matching the dosimeter stain in density is found. Each color segment carries a number which is noted and referred to a table on the face of the dose estimator giving does information for the badge.

The Hydrazine Dosimeter Badge meets the requirements for personal monitoring of exposure to both Hydrazine and Mono Methyl Hydrazine (MMH). A unique dual chemistry design minimizes any chance of false readings. Two circular windows allow each tape chemistry to be exposed and observed. An automatic color change occurs in each tape in the presence of either substance. The reaction for Hydrazine is somewhat different from that for MMH and two Dose Estimators (color wheels) are required; one for each substance.