The application features such tools as a graphing calculator and a unit converter. Casio produced the first commercially available graphing calculator, the fx-7000G, in 1985. Rating changes can be calculated manually by using the FIDE ratings change calculator. Sharp produced its first graphing calculator, the EL-5200, in 1986. In addition, HMRC provide an online National Insurance Calculator. For example, assume a simple calculator. The software allows for the syncing of documents to and from the calculator and/or computer. Among these was the PROGRAM Programmable Scientific Calculator which featured reverse Polish notation. Assume the simple calculator from above once more. A GS1 check digit calculator and detailed documentation is online at GS1's website. A free online ELECTRE calculator written in Python. The HP 12c financial calculator is still produced. There is also some overlap with the financial calculator market. The second option is being able to code the programs on board the calculator itself. Ecohero also contained other functions, such as a carbon calculator and eco-encyclopedia.