Diagnostic reader advice needed

Hi I'm needing to buy diagnostic stuff for car,could people recommend a good cheap option plz

Scangauge or an ultragauge allow for reading codes and allowing you to see engine perimeters at the same time. If it’s pure diagnostic your looking for Carly allows for diagnostic and also clear codes etc

I can recommend Carly.
I’ve used it to do a bit of coding as well

Thank you