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60 Day 100% money back guarantee.Two genuine Hellma 4-piece cuvette sets: one 283-QS (quartz/Suprasil) and one 181-OS (optical glass), each marked 1.000 (10 mm pathlength). Eight cells total with white PTFE caps/stoppers in fitted cases. QS is suitable for UV-VIS work; OS for VIS applications. Exteriors show normal lab wear; optics look clear to the eye, but no functional testing was performed. Case lids have heavy sticker residue (see photos). Ships from Carol Stream, IL.Keyword Block: hellma, cuvette, quartz, suprasil, optical glass, 10 mm, 1 cm, uv-vis, spectrophotometer, optical cell, 283-qs, 181-os, four-piece, lab glassware, pathlength, set
