This is a slide rule, because apparently in addition to being a huge nerd, that guy was a time traveller from the 50s.
(In-game plural: slide rules)
|TOP 10 slide rule collections|
6. Misha_Z - 74 | 7. Ms Bus Driver - 70 | 8. MrSqueezeBox - 68 | 9. Mistress of the Obvious - 62 | 10. PolyesterMan - 61
Collection data courtesy of ePeterso2 and Jicken Wings