For transmission measurements of samples with varying sizes and thicknesses, the variable collimating lens holder is the ideal tool. It features adjustable vertical bars that can accommodate samples up to 160 mm thick. The base is constructed from anodized aluminum and includes adjustable mount bars, each equipped with four 3/8”-24 threaded holes for attaching COL-UV/VIS collimating lenses. Adjusting the bars is simple: just loosen the screws and slide them into position. The holder comes with two COL-UV/VIS collimating lenses, providing everything you need for precise measurements.