fresh roast sr540 fresh roast the sr540 is the newest addition to the sr family of coffee roasters. roast capacity is 4 scoops, 120 grams. it has an improved control board. all adjustments are made with pushing the knob and turning to adjust the heat, fan, and time. it also features a real-time temperature read out. a quick turn of the knob to the right will display current temperature. there are now 9 levels of heat adjustment compared to having a low, medium, and high adjustment. the fan also has a wider range of adjustment. the chaff basket and top lid from earlier sr roasters will not fit on the new sr540. the roasting chamber is a much larger diameter. users are also able to change the default start settings. these are only 120v and have a 1-year warranty. warranty is void if shipped outside of the us.