plug cap for square spectrophotometer cuvettes
https://www.caninephenome.org/shop/gen-sts-111167-plug-cap-for-square-spectrophotometer-cuvettes-44404
https://www.caninephenome.org/web/image/product.template/44404/image_1920?unique=5ed9fe4
These cuvette caps are produced from low density polyethylene (LDPE) and easily snap into the square cuvettes to provide a complete seal. This provides added protection against spillage and contamination.
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