There is a special place in the universe where a person with passion has the hard work to really make a difference. This is exactly what Shawn Dawsey from Downhole Diagnostic has done! Downhole Diagnostic diagnoses your downhole!  I use a Fluid Level Gun and a Dynamometer (Dyno) [metaphorically depicted above] to determine the fluid level and measure the downhole pump performance on Rod Pumped Wells.  To be more precise, Dynamometers are only applicable to Rod Pumped wells while Fluid Level Surveys can be used on any type of producing oil or gas well that doesn't have a Packer (Fluid Level Shots can even be taken down the tubing, for example:  if a tubing leak is suspected).   I then submit my findings in a concise report along with any optimization recommendations.