Water hardness test kit. No self respecting espresso machine owner should be without one of these.
First of all to initial work out required levels of filtration. Second of all to use for ongoing monitoring. This kit reveals all.
Most of all the small kit can be carried an used almost anywhere. Therefore if the espresso machine is mobile and uses alternative water supplies, you can test them easily.
Using an adjustable filter cartridge head tweeks can be made to the filtration of the water.
The water hardness test kit simply consists of two parts. The liquid and the tube. consequently it is truly mobile. Moreover it is fun to use.
See reference charts and read all about it on the blog.
Yes it is deep, a bit complex and very academic. But everyone in the coffee business should have at least a basic understanding of water filtration.
Else we must ask ourselves what exactly is it we are drinking?