Thank you for viewing. The appendix for the DIME September/October combined issue is a 90x smartphone microscope. *Uses 3 LR44 button batteries. Button batteries are sold separately. For observing pen tips, fingerprints, pores, scalp, banknotes, leaf veins, etc. I am selling this because I didn't use it after purchasing it. How about it for your child's summer science project? ◎This item has been stored at home. ◎Inspection is limited to the exterior. ◎This is a personal inspection. ◎Although it is new and unused and unopened, it will be opened to protect it with cushioning material during packaging. ◎It will be shipped via Yu-Packet Post Mini. Please purchase after understanding the above. #ScienceProject #Observation #SmartphoneMicroscope #Microscope