Are yes the pocket calculator.
I worker in the aero space industry, and in the course of my work needed to make many calculations that needed trigonometry to work them out.
Before the advent of pocket calculators, we needed to use large Monroe mechanical calculators, along with a 6 inch thick book of trigonometrical tables.
Then came the electronic desk calculator, that was so expensive to buy, they had to make a security cage to go around it.
The scientific pocket calculator then became almost affordable, seventeen shilling and sixpence I think, we then had the opportunity to purchase one for ourselves and have so much a week stopped out of our salary, till it was paid for.