The Drummond pipette controllers are a staple in any biological lab and are complete workhorses for liquid handling. These units have been cleaned inside and out, each component was checked with a multimeter, and have had their rechargeable batteries replaced with 200mAh Ni-MH rechargeable 9V batteries. Additionally, their functions were checked with a 10 mL serological pipette and were found to hold water with no leaks or drips (see pictures)! Included with the pipette controllers is 1 charger which is more than sufficient to keep both of these pipette aids going.