Siemens Variac This Siemens branded variac - while marked as 220V ( Euro single phase ), can be used at 120V as long as one does not exceed current ratings. ( You do the Math. ) Core measures approx. 3" L x 3.5" diameter. Pic shows specs., wiring info. Weighs in around 5 lbs. Price: $40.00 shipped -( CONUS / AK / HI )- PayPal preferred, USPS MO accepted.