![What does the “EX” function do on this calculator? For ref, it's the one in from the top right near the OFF button. : r/calculators What does the “EX” function do on this calculator? For ref, it's the one in from the top right near the OFF button. : r/calculators](https://preview.redd.it/tp9q1qj8s5d71.jpg?auto=webp&s=5529473f75034aca37865ca16cc3dd751ca9d0ac)
What does the “EX” function do on this calculator? For ref, it's the one in from the top right near the OFF button. : r/calculators
![HEUER | REF 150.633 CALCULATOR CHRONOGRAPH, A STAINLESS STEEL AUTOMATIC CALCULATOR CHRONOGRAPH WRISTWATCH CIRCA 1970 | Watches | 2020 | Sotheby's HEUER | REF 150.633 CALCULATOR CHRONOGRAPH, A STAINLESS STEEL AUTOMATIC CALCULATOR CHRONOGRAPH WRISTWATCH CIRCA 1970 | Watches | 2020 | Sotheby's](https://sothebys-md.brightspotcdn.com/dims4/default/a0424b8/2147483647/strip/true/crop/2000x2000+0+0/resize/2048x2048!/quality/90/?url=http%3A%2F%2Fsothebys-brightspot.s3.amazonaws.com%2Fmedia-desk%2F92%2F45%2Fc29ae2eb4a99a61d45958d8fb860%2F1001n10378-bkkjl.jpg)
HEUER | REF 150.633 CALCULATOR CHRONOGRAPH, A STAINLESS STEEL AUTOMATIC CALCULATOR CHRONOGRAPH WRISTWATCH CIRCA 1970 | Watches | 2020 | Sotheby's
![Aurora Desktop Calculator 12 Digit 4 Key Memory Battery/Solar Power 105x17x175mm Black Ref DT920PX - ASAP Distribution - Film and TV Consumables Suppliers Aurora Desktop Calculator 12 Digit 4 Key Memory Battery/Solar Power 105x17x175mm Black Ref DT920PX - ASAP Distribution - Film and TV Consumables Suppliers](https://cdn3.evostore.io/productimages/ot_wholesale/l/112374.jpg)
Aurora Desktop Calculator 12 Digit 4 Key Memory Battery/Solar Power 105x17x175mm Black Ref DT920PX - ASAP Distribution - Film and TV Consumables Suppliers
![Amazon.com: Canon AS-1200 Calculator Desktop Battery/Solar Mark-up 12 Digit 3 Memory Keys Dark Grey Ref 4599B001AA, 215596 : Office Products Amazon.com: Canon AS-1200 Calculator Desktop Battery/Solar Mark-up 12 Digit 3 Memory Keys Dark Grey Ref 4599B001AA, 215596 : Office Products](https://m.media-amazon.com/images/I/71GfdFxdsAL._AC_UF894,1000_QL80_.jpg)