60 Day 100% money back guarantee. Nikon Plan 100x/1.25 Oil Ph4 DL objective for finite 160 mm tube microscopes. Marked 160/0.17 for standard 0.17 mm cover glass and phase ring Ph4. RMS thread mounts on many Nikon and compatible stands. Barrel and threads show normal use; immersion oil residue visible from prior use. Front and rear optics appear clear in photos with no obvious chips or haze. No performance testing or cleaning has been done by us. Includes protective case shown. Great for biological phase contrast work where high NA and flat field are needed. Keyword Block: nikon plan 100x, 1.25 oil, ph4 phase contrast, dl objective, 160/0.17, rms thread, finite tube, microscope objective, japan