The best propagator on the market????? need help!

Looking for the best propagator that actually work. Have had a few but don't seem to work. They either get to hot or to cold. Looking for one with a automatic thermostat so it keeps a constant temp that I pick. If there something I'm missing please tell me. Thanks.

The best propagator on the market is scattered about in numerous locations.. What I am saying is that a do it yourself project is always way cheaper and you get to customize every aspect to fit your personal needs. For $21 I put together a 5 site dwc cloner. Works perfect every time and I have better success than 50% of the guys out there. For another $10 this design could easily be turned into a 20-30 site setup. As far as your heat issues go, an adjustable mat should fix your problem.
https://www.rollitup.org/blogs/658349-dgringo69.html