![Does anyone know what this was used for calculating? Both rings rotate clockwise freely but lock in this position when rotated counterclockwise. It seems to be a very specific type of calculator Does anyone know what this was used for calculating? Both rings rotate clockwise freely but lock in this position when rotated counterclockwise. It seems to be a very specific type of calculator](https://i.redd.it/bfyeoewyqzx21.jpg)
Does anyone know what this was used for calculating? Both rings rotate clockwise freely but lock in this position when rotated counterclockwise. It seems to be a very specific type of calculator
Dial Pixel - IVT is a Forth-programmable scientific RPN calculator that fits in 8 kilobytes. The device consists of an ATtiny85, an OLED display, a touch-sensitive keypad, and a CR2032 battery. -
![Large Date Calculator Double Wheel - Item #DA20DW-L - ImprintItems.com Custom Printed Promotional Products Large Date Calculator Double Wheel - Item #DA20DW-L - ImprintItems.com Custom Printed Promotional Products](https://www.imprintitems.com/userfiles/files/asi-media/21670414.jpg)