Automatic reservoir for serial pipetting

An automatic reservoir for serial pipetting was constructed and used in radioimmunoassay determinations. This device features negligible priming volume, minimal solution loss, and lowered overall cost. In our experience, it has proven valuable when used with an automatic pipetting station. This apparatus has not affected the precision or accuracy of the procedure. It has made it possible to economize on costly antibody reagents supplied with radioimmunoassay kits, especially in use with low-volume assays.