Mechanical Calculator (5e Equipment)
From D&D Wiki
A mechanical calculator is a bulky clockwork gadget which can perform basic arithmetic: addition, subtraction, multiplication, and division. It has buttons which are used to input numbers, which can be expressed in denominations of the local currency. A lever on the side is pulled to perform the calculation. Once the lever is pulled, the calculator spits out a piece of paper with the result on it. Many large businesses and government offices make use of these machines.
Cost: 2,000 gp
Weight: 50 lb.