anyone recomend descent leakdown tester?

I'm looking for a descent leakdown tester to purchase, i dont have to have a real fancy one, but one that will get the job done. I'm having smoke upon de-acceleration and can not figure out why!?!?!? Compression test shows 150psi on every cylinder, there isnt one cylinder thats 149 or 148 they are all 150 dead even and it gets there within 5 seconds of cranking it over with the carb opened up all the way and i'm 4000 feet above sea level. So with such a beautiful compression test i'm baffled as to why its smoking upon de-accleration.....