we use the weekly protein tests and have done for awhile, we use them on instruments that have come out of the ultrasonic bath,The test you are talking about came to us with instructions there is also a number you can call on the bottom of the leaflet, call it they are happy to explain. The control pack is to show you how the test works, ie unscrew the pot, take out the blue brush and dip in distilled water, rub over the instrument, then place in to the pot, if the colour stays yellow/brown there is no protein, if the colour changes to any shade of blue then there is protien,if you used the control pack you would do the same only rub the brush over the silver metal and this will turn the water blue. hope this helps alittle?????