well,i think this should get you all going.i have been in refrigeration now for 46 years and now in the next couple of years will have to hang up my gauges.looking at some of the test questions i will never pass the test so it seems i have been very lucky to get through life without enthalpy charts etc.why should we be told we cannot carry on without this certificate.i served my time with frigidaire and we did not have any courses,apart from electrical at the local tech.unlike today where all the apprentises are taught all this,yet when you watch some of them work they know all the answers but cant do it.so come on,give us oldies a chance.i dont want to retire yet but it looks like i have no choice