[Pavel Chaloupka]

I think the best way to deal with it is to obtain some better quality digital device and learn how to take care of the electrode. It takes just about the same time as the use of drop test, but you get much more accurate readings. If you sum the money spent on higher quality drop tests over time, it may be even much cheaper. The pool stuff may not even measure in the range needed for Paro tanks. + it is always hard to use drop tests in dark stained water.