Ultra thin, optically clear flat well bottom permits direct microscopic viewing, resulting in lower background fluorescence and enabling readings down to 340nmOpaque walls to prevent well-to-well crosstalk. Can be used for both top and bottom reading instruments. Flat bottoms with 360µL total volume. Recommended working volumes of 75 to 200µL. Sterilized by gamma radiation and certified nonpyrogenic. Without lids, lids supplied separately.