HEATHKIT SB-610 MONITOR SCOPE FROM THE HEATHKIT SB LINE. THIS IS A WORKING SCOPE IVE USED FOR 11 YEARS FROM MY HK SB LINE STATION WHICH IM SELLING DUE TO DOWN SIZING. IVE ENCLOSED PHOTOS OF IT OPERATIONAL DEMONSTRATING ITS TRACE. MONITORS THE TRANSMITTED SIGNAL IN HF FREQUENCIES $125 PICKUP OR SHIPPED AT YOUR COST