International Chemistry Olympiad - IChO - For the competition purposes, all the competitors will be given a calculator Casio fx-991EX. The manual for the calculator can be downloaded from the following link:
![Casio fx-991ES Plus Scientific Manual Calculator fx991es fx 991 es Solar Battery 4971850182276 | eBay Casio fx-991ES Plus Scientific Manual Calculator fx991es fx 991 es Solar Battery 4971850182276 | eBay](https://i.ebayimg.com/images/g/yWAAAOSwcVBiEI53/s-l1200.webp)
Casio fx-991ES Plus Scientific Manual Calculator fx991es fx 991 es Solar Battery 4971850182276 | eBay
![Casio calculator guide - QUICK START GUIDE fx-991EX edu.casio/ The fx-991EX “ClassWiz” features a - Studocu Casio calculator guide - QUICK START GUIDE fx-991EX edu.casio/ The fx-991EX “ClassWiz” features a - Studocu](https://d20ohkaloyme4g.cloudfront.net/img/document_thumbnails/8547a1d98decf734d16c47077f5322d4/thumb_300_388.png)