EliteChem Our UltraClear™ digestion tubes are crafted to deliver superior clarity and quality, surpassing any other digestion vessel available in the industry. In addition to their outstanding transparency, these tubes feature redesigned in-molded graduation markings that meet ASTM El272-02 Class A standards, ensuring easy readability. Made from proprietary 100% virgin-grade resin with ultra-low teachable metal metal content, these tubes provide exceptional performance. Each case includes a Certificate of Analysis and Volume Accuracy. When paired with our wide range of colored caps, they integrate with laboratoy equipment, offering enhanced organization and seamless functionality.