(en.wikipedia.org/wiki/Erythrocyte_sedimentation_rate) -- From Wikipedia
Sorfa ESR SYSTEM consists of an ESR Pipette and an ESR Tube with 3.8% sodium citrate diluents used for testing in hospitals and laboratories. High transparent polystyrene and clear graduation from 0 to 150mm or 170 mm make ESR pipette easy to read in accurate volume. Each pipette includes a filter plug to prevent passage of particulates from the top of pipette.
To perform test, ESR tube is prefilled with 3.8% sodium citrate diluents to simplify the process. All Sorfa ESR pipette is packaged in bags with sterilization, RNase-free, DNase-free and Non-pyrogenic.