There have been way to many times when I have picked up avocados with the intention of making my favourite guacamole recipe only to discover that they are too ripe, brown and mushy OR too raw and have to be left on the windowsill for days leaving me slightly pissed off and with a mean guacamole craving (not many legitimate substitues for this one). 

Check it.  A fool proof way to buy avocados…I know…its the best discovery ever.