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This is HL-340 USB serial Converter also called USB to DB9 or USB to RS232 com port or USB to serial cable
Long life and low cost
5-bit handheld digital meter with stable performance
reading 1999
Individually programmable weak pull-ups
Em-18 Em18 Rfid Reader Module r300 wick This is HL-340 USB serialThe EM18 RFID Reader Module is your gateway to seamless 125khz RFID card reading. Whether youre building an access control system, inventory management solution, or attendance tracking application, this module delivers reliable performance. Heres why youll love it. Key Features: Compact Design: The EM18 module is small and easy to integrate into your projects. 125kHz Read Frequency: It operates at the widely used 125kHz frequency, making it compatible