: You can find the original RS232 driver and utility diskette contents on Internet Archive . This typically includes a basic Windows application and programming examples.
: A legacy version of the Protek DMM software (originally for Win95/DOS) is hosted on Elektrotanya . You may need to run this in Compatibility Mode for Windows 7. Protek 506 Software Windows 7
: The Protek 506 is identical to the Voltcraft VC506 . Both are compatible with Datalyse , which supports graphical measurement and data logging. Connection & Setup Requirements To successfully connect the meter to Windows 7: : You can find the original RS232 driver
For the , official modern software support for Windows 7 and later is essentially non-existent because the original manufacturer links are dead. However, you can still get the device running using archived files and compatible third-party tools. Available Software Options You may need to run this in Compatibility Mode for Windows 7