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Well, I'll see what they do, using a rubber hose that slips on the end of a pH probe and then another size larger over top of that to provide more surface area and then notching the outer hose to faciliate a grove for an O ring makes a simple water tight seal between the water and the KH solution and allows fast equilibration.
Very cheap once you have some poly membrane.
The KH solution is a snap to make.
I think a lot of folks will use the drop checker as it's easier etc, but there will be a crowd that likes the membranes.
Regards,
Tom Barr
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