In case you wanted to learn how to perform arithmetic with the Curta for your coffee making, I've transcribed the 1950s manual: https://trmm.net/curta/

For the people who complained that the Curta was overkill and I should use a sliderule, I tried it this morning and calculated that 2.1*10^-2 kg coffee at a 1.5*10^1:1 ratio is about 3.15*10^-1 liters. Or something like that within a few powers of ten.