The SSR-Ex is a 2nd generation instrument designed to be SAFE, SIMPLE, and ROBUST. This instrument is rated for ATEX Zone 1 and Zone 2 hazardous areas aboard ships. To make the SSR-Ex SAFE, we created a Patent Pending method for isolating electronics from the “Wet Chemistry” area of the instrument. This means that an operator can open the enclosure at any time to service the unit without using a bypass key, or exposing the electronics to a potentially hazardous atmosphere. The SIMPLE, 4 button interface panel and color screen allow for easy manipulation and viewing of 0-15ppm Chlorine measurements at any time.