Comparison : Item # MD-250-E, 5.28 Inch (in) Length Medical Grade Isolation Power Transformer
Item # MD-250-U, 5.28 Inch (in) Length Medical Grade Isolation Power Transformer
Item # MD-500-E, 6.38 Inch (in) Length Medical Grade Isolation Power Transformer
Item # MD-500-U, 6.38 Inch (in) Length Medical Grade Isolation Power Transformer
Item # MD-1000-E, 7.17 Inch (in) Length Medical Grade Isolation Power Transformer