GIA Gem Instruments Polariscope Model 415. Condition is "Pre-owned yet not used Almost mint condition gia polariscope. I work in my family owned jewelry store in business 30 years now and we have a master jeweler gia graduate! We have about 4 of these in the shop but this one I don’t believe has been used. I myself do make the sales in our store but I’m no gia gemologist so I don’t know if this requires the oil or if it doesn’t ..the extra lense piece is in bag doesn’t look to be used ..the tweezers are there and also I plugged it in and switched the on button and there was light ..so it is in working condition. I honestly don’t believe we have ever used this one because our jeweler has what he uses on his bench so your getting this collectable gia device that works and comes with tweezer and extra lense it looks like and looks as if it it’s never been touched. Please look to pictures and ask questions before purchasing or bidding