For high throughput screening and other automated applications. Clear polypropylene tips are RNase-, DNase-, endotoxin-, and metal-free. Available sterile or nonsterile. All tips are supplied in sturdy, closed-well racks designed to withstand use with automatic pipettors. Refillable racks can withstand repeated use with automatic pipettors. Racks feature lift-off lids. Tip 82009-994 requires pipettor head height to be adjusted.