Hp 5228a Frequency counter. 0 to 1200 Mhz. Has the hp 10544a High stability time base. This is a 100 Mhz counter with a divider circuit added to make it go to 1200 Mhz. Counter has also been rfi proofed by adding ac input filter, rf gasket, and screening in front of display. Has had any questionable capacitors replaced and has been checked for operation. $125 Shipping weight is 20 lbs, but can be picked up at the Atlanta/Marietta hamfest next Sat June 3rd.