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Here is a Nikon Plan APO 4x/0.2 Microscope Objective Unit 13 Magnification: 4x Thread: M25 Application Markings: Plan APO Immersion: Dry Working Distance: 15.7 Each objective has been completely inspected and cleaned by a technician. If objective is adjustable/spring loaded it is lubricated and verified that its mechanical parts move well. Feel free to contact us if you are unsure this objective will fit your microscope.