Spring servicing time, and one task on my list was to check the condition of the coolant in the system. Time to get out the Refractometer, a tool which I rather enjoy using, but which of course rarely sees the light of day.
Coolant condition suitably assessed, the thing now gets put away, probably for 3 years. Next winter it's coolant change time, the winter afterwards experience tells me it'll still be fine, so it won't be needed until 2027 probably.
What other tools do we enjoy using but hardly ever need?
