MCFARLAND #7 16X100mm tubes: McFarland Standard, Latex Equivalent # 7, 8ml, 16x100mm tube. The McFarland Latex Standards are prepared from suspensions of uniform latex particles with similar absorbance values as the original barium sulfate standards. The stability of McFarland Latex Standards allows for a significantly longer shelf-life than the original barium sulfate standards due to reduced light sensitivity.
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