Connecting SKU_SEN0463 geiger counter to raspberry pi

Hi I'm new to rpi, I want to read data from this geigeer counter into a raspberry pi to send to my pc. I bought this but quickly realised I don't know what the fuck I am doing. What do I need to connect the device to the raspberry pi? I did come across this product, is it needed? https://www.dfrobot.com/product-1730.html

Can you link the Geiger counter

Also just like to say that's pretty cool. Might be one of my own projects one day actually