The R2 Extract combo is an incredible set to take your coffee to new heights.The refractometer is easy to use and I was able to easily get accurate readings with my pourover brews. The readings seemed coherent with what I was tasting in the cup and reflected the changes I made to grind size, temperature, and pouring style. Very impressive!The scale is super accurate and extremely fast. The integrated flow rate display makes it easy to track your pouring and agitation for pourovers, or when doing pressure or flow profiling with espresso.Bluetooth and app integration is excellent and very easy using iOS. I was able to configure both devices using the DiFluid Cafe app, but I really only use them within the excellent Beanconqueror app that I have been using for well over 2 years now. Both devices integrate perfectly with Beanconqueror and I was soon looking at incredibly detailed flow/weight graphs while also adding the extraction yield to each brew.In summary -- if you are looking to truly explore your brews and go deep into coffee science, the R2 Extract combo is an excellent set of tools that will help get you there.