Sample bottles are supplied in 100ml usually, but 250, 500 or 1L for enhanced suites. Bottles come in packs of 10 with differing postage options (with or without LubeWear Swift courier collection that can accept your liquid samples for transport – note in 2024 Royal Mail banned liquid return postage (even water) so the lab no longer offers return postage via freepost). Provide the hyperlink to customers to buy them. https://oilanalysislab.com/shop/sample-kits/lube_fluid_analysis/