The Wensn WS1361 is a cheap but decent quality Sound Level Meter from China. You can get it on Aliexpress for $25-30, for example here: https://www.aliexpress.com ...

This library is the result of reverse-engineering the communication protocol of a Chinese USB 125Khz RFID Reader/Writer. A detailed document describing the whole procedure can be found at the wiki ...

There was a time when instruments sporting a GPIB connector (General Purpose Interface Bus) for computer control on their back panels were expensive and exotic devices, unlikely to be found on the ...