The last 2 videos posted here are showing the current consumption of Canique Ambience (rev 1.2.0) with its pulse counter connected to the RPM signal of a fan.

The values measured (input voltage: 1.84V) are:

a) 1.05uA with the fan not spinning

b) 1.25uA with the fan spinning @ 900 rpm

Of course you could just as well connect the pulse counter to a rain gauge, a button (to count button presses) or some similar switch.