This Bio-Rad Powerpac 300 Electrophoresis Power Supply is in great condition and is guaranteed to be functional. This unit came from a local lab that had surplus lightly used equipment. We urge customers to view all photos as they show overall condition, included accessories and functionality. Please feel free to contact us with any questions. Please Note: The only minor issue worth noting is periodically the fan will be slightly noisy. Noise seems to go way with time and does not affect functionality in any way. Biorad PowerPac 300 Electrophoresis Power Supply The Biorad PowerPac 300 Electrophoresis Power Supply provides constant voltage or constant current to instruments used in electrophoresis and blotting. The PowerPac is capable of adjusting the voltage output from 10 to 300 volts in increments of 1V, as well as the current output from 4 to 400 milliAmps in increments of 1 mA. Up to four electrophoresis cells can be connected in parallel to the power supply. The power supply operates at the values specified for the constant parameter, however to prevent damage to your electrophoresis cell, the PowerPac provides automatic crossover to constant current or constant voltage depending on which set value is first reached.