Precision engineered aluminum alloy and stainless steel. Recommended for DMC, DMSCC, antibiotic, and other tests performed by certified laboratories. Each pipettor may be calibrated by user and is engravedwith a serial number for GLP record keeping. Along with a lifetime guarantee, the manufacturer provides full calibration and repair services. Exact fit pipet tips for the MLA D-Tipper Pipettor. These pipet tips are held in a tray and non-sterile.