It is not just scientific, it is Advanced Scientific! Unfortunately there are display problems with this vintage TI-68 (2nd pic). It is otherwise in very nice shape. Can this sub help with
TI-68 - Wikipedia
Texas Instruments TI-68 Advanced Scientific Calculator from Cole-Parmer
Texas Instruments TI-68 Advanced Scientific Calculator With Cover & Manual | eBay
Texas Instruments Ti-68 TI68 Advanced Scientific Calculator Tested Working for sale online | eBay
TI58C, the programmable calculator!
TI-80 - Wikipedia
Eddie's Math and Calculator Blog: Retro Review: Texas Instruments TI-68