This Thermo EC Electrophoresis Dual Power Supply EC-135-90 is in real good condition and guaranteed to function 100%. It came from a local lab that was upgrading equipment and we can accept pay pal or your credit card. Please contact me with any questions. Model Number: EC135-90 Description: The EC135-90 is designed to operate in constant voltage or constant current, featuring a continuously variable output in either mode. The EC135-90 automatically crosses over from one mode of operation to the other when the preset limit has been reached. The EC135-90 is a compact and highly versatile power supply for PAGE SDS-PAGE, DNA or RNA submarine gels. Specifications: Operating Voltage Range: 500 V Operating Current Range: 500 mA Maximum Output Power: 250 watts Output Modes: Constant voltage or constant current with automatic crossover Number of Output Terminals: Four sets of recessed 4 mm connectors (female) Safety Interlock Load sensing shut-down-on-disconnect Key actuation necessary to activate high voltage In event of a power failure, automatic restart is provided Timer: Dual-functin up/down timer, 99 hr 59 min which deactivates high voltage upon reaching zero time remaining in the count-down mode Dimensions (W x D x H): 225 x 303 x 145 mm Plug Style: (120000000000000V) Leads Not Included