H-P 5256A Heterodyne Frequency Converter, 8 GHz to 18 GHz. This plug-in extends the range of the H-P 5245/5246 Frequency Counters and with the H-P 10590A Plug-in Adapter, extends the range of the popular 11-digit 5345A Frequency Counter. Input is via APC-7 connector. Sensitivity: -7 dBm to +10 dBm. Used, guaranteed. Price $300.00

H-P 5314A Option 002 Universal Counter. Very portable, seven digit, 100MHz Counter with sensitivity of 25mV. Option 002 adds an internal gel cell battery pack for up to 8 hours of truly portable operation; battery voltage sensor automatically shuts instrument off when battery voltage drops. It also measures time interval (channel A starts count , Channel B stops count), Ratio (A-B) and Totalize. Used, guaranteed, available with brand new battery pack for- $225.00 Without battery pack- $195.00 (operates normally on AC without battery pack installed, or option 002 can be de-installed if you wish)