Not given in the title ("Chemical Sensing Indicator" no "s") or picture (which shows one) is that each box has two (2) sensors, so one for detergent and one for rinse aid. (Sanitizer should be a blue foam stopper instead of black... not sure where to obtain that although in my case I didn't need it.) Trim off the very end of the stock tubing so it will grip on the new sensor tube and plug the electrical end into the back of the machine in the appropriate spot; very easy installation. The stopper has gradations at 1-1/8, 1-1/4, 1-3/4 and 1-15/16. I found it fell through the top of my large pail of detergent. My solution was to cut a hole in the plastic cap of a diameter near one of these sizes (I used 1-3/16 to match the 1-1/4 part of the stopper). Then you can fit it Read More
Thank you for your review! We are glad you are enjoying this indicator. Please note that we cannot recommend modifying items outside manufacturer recommendations as this may potentially affect performance.