Ludlum model 2221 Scaler/Ratemeter SCA with Top loaded RS-232 adapter for GPS use-Like new – CHP Consultants – Products and Health Physics Related Services
South L7U50 / RS-232 7 pin to USB | Lowest price online | Global GPS Systems
Amazon.com: Geekstory CP2102 6 in 1 USB-UART Serial Adapter Module USB to TTL 485 232,TTL to 232 485,RS232 to 485 + 4P Dupont Cable Jumper Wire Female to Female, for Windows, Linux,