I agree with Suzy and Alex. The Cadenza and Sequenza "coverplate" system is
not only economical it is very easy to use, frees up hands on time and we
end up saving on primaries that we now dilute up to 1:500 that use to be
used neat. We even do overnights in the fridge. We put a damp paper towel in
the lid if we go overnight. We have never had a dry out problem and I work
in Arizona, where humidity is only found during monsoons. Although they
suggest not reusing the coverplates we do routinely without problems.