Manufactured bye Mark V Laboratory, for Etching Mounted and Un-mounted Samples to show Grain, Case Depth etc. The MVEE Features a Dual Range 1-15 & 15-30 DC Power Supply with Output Voltage@ 0-2 Amps with voltage regulation load of less than 0.1% from no load to full load. Dual Meters simultaneously monitor the output voltage and current. The system comes complete with Stainless Steel Cathode and Anode, Pyrex Etching Chamber with Lid, 24" Connector Cable, and Reagents Chart. 110V 60Hz 220V 50Hz.