The ‘M’ is the original, the butane powered vaporizer that started the Dynavap legend! It is incredibly well engineered and virtually indestructible being completely constructed from metal.
The Dynavap ‘M’ provides superb vapour quality through a combination of conduction and convection heating. While, as with most manually heated vapes, a learning curve does exist for the ‘M’, it is easily conquered through the use of a bimetallic thermostat inside the cap which makes an audible click when the temperature is right for use and again when it is time to reheat.
The 2020 “M”, still constructed from medical grade stainless steel, now features the Captive Cap functional geometry, faceted tip with airflow serrations, adjust-a-bowl technology to reduce the extraction chamber by 50% for easy micro-dosing, chiral airports for calibrated high turbulence air injection, and a 10mm tapered mouthpiece.
Dynavap products are probably the most manufacturer supported vaporizers on the market today. Every detail regarding the construction, operation and helpful tips can be found at their website (https://www.dynavap.com/about/faq/) or on YouTube.