The Quest M3s now comes with one analog thermometer in the face, insulation around the drum and a chaff collector under the drum.
It's hard to define what the Quest M3s Coffee Roaster is, exactly; it falls in-between the current categories of small-scale coffee roasters. It is hand-built, one at a time, in a small workshop factory in Taiwan. It has no advanced electronics, no motherboard or chipset, no heat profiling or automated cooling cycle. This is basically a miniature shop roaster scaled down to sample roaster size. It is a very manual machine and therefore most suitable for an experienced professional coffee roaster. It's not a Probat sample roaster (nor is it priced like one!) Yet it has some similar features: a sample trier so you can view coffee from the drum while roasting, a sight glass to see roast progress, manual temperature control (a dial adjusted gauge shows you the amperage sent to the heat elements), airspeed control (fan speed controls volume of air pulled through the drum. A timer essentially functions as an on/off switch and allows you to cool the roaster down when you are finished with your batches, as well as acting as a safety shut off if the roaster is left unattended. It has an ingeniously simple way to cool the coffee; you dump the batch into the tray like a little shop roaster, open the rear door to the chaff collection chamber, and set the tray there so cool air can be pulled through it. Outside-the-drum cooling in 3 minutes or so ... another great advantage over most home roasters. Important! Turn the amperage all the way down when cooling your coffee. The drum will retain heat with the amperage down, but if left on it can overheat the roaster.
The Quest is designed for continuous roasting, once it is properly warmed up you can roast for hours. In fact, this is the way to use the machine, as heating it up to do one batch and cooling it back down right away could cause wear and tear on the drum. So, in this sense, it is much more like professional sample roaster. The Quest M3s has lots of power and, as a miniature shop roaster, it requires a knowledgeable operator too. You can have a chaff fire in a hurry without cleaning it, and it's not so consumer-oriented in safety design either; like a Probat, there are lots of hot surfaces to remind you where your fingers should and should not be during roasting.
With an Allen wrench and a screwdriver, the Quest M3s can be stripped of its bodywork, the drum pulled out of the motor drive, and any part accessed in minutes. It is incredibly straightforward in terms of wiring and parts. For example, it uses a commonly available computer fan for air intake. Heating elements can be changed out quickly if need be. It is ready for any type of modification you might desire, such as PID control of the burners. (Not that I would want to automate anything here - the idea is a manual roaster with a trier to pull samples. Yes, it's a tiny, tiny trier but it works!) We did have trouble with the initial heating elements sent with the machines, but we worked with the manufacturer so now the heating elements have a higher electrical rating (up to 130v). The Quest M3s is very quiet and runs on standard US voltage (120v, 60 hertz). You'll be impressed with the ease, convenience, and consistency that you can achieve roasting coffee with this electric roaster.