In general, it's much better to roast by weight, not by volume. Some air roasters, like the Fresh Roast actually use the volume of the beans to block the hot air and build up heat in the chamber - so the volume is somewhat more critial than the weight - but for most roasters, measuring the batches by weight will give you greater consistency. We offer two different scales for weighing roast batches, a fairly inexpensive model that works well, but can't double as an espresso dose scale, or a really nice one that is super accurate and might be a good option for the obessessed.
This scale is accurate enough to use for roast batches, the Salter Electronic Scale. It's designed as a "baker's scale," to weigh out ingredients for culinary creations. It weighs in Pounds/Ounces or Grams (sensitive in 1/8 oz. or 1 gram increments), it can be re-zeroed (that is, you can set a tare), it's battery powered, and it's great for dieting or baking too. It can be used as a scale for espresso doing, but the other scales we offer are better for this use. You can also use it to measure all water-based liquids in fluid ounces (1/8 fl oz increments up to 175 fl oz maximum) though I can not exactly figure out how that works since different liquids have different densities. I guess this scale is smarter than me! Lithium long-life battery included.
$35 (+ 2.75 lbs shipping)
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Professional Cupping/ Roasting/ Dosing Scale
Expensive .. but this is an amazing scale. It's the one I use daily for the cupping lap, for weighing roast batches, and for weighing espresso doses. It's incredibly accurate and fast. If you use a scale a lot, you really do need a good one such as this. I use it mostly in gram increments, where it is accurate to one-tenth of one gram! It's great for weighing green samples to perform moisture content readings. It's a pro-level scale for sure, but compact too. I put away my expensive, digital Ohaus gram scale as soon as I got this one! Here are the specs: Capacity 21.165 oz x 0.005oz / 600g x 0.1g / 1 lb 5.15 oz x 0.01oz / 1.3228 lb x 0.0003 lb. Fine increment measurements allow for precise measurement of lightweight ingredients such as spices, herbs, loose tea and coffee. Count option can be used to calculate the number of items placed on the scale. Stainless steel 5.75" x 5.25" platform is removable for easy cleaning. Tare, auto off, and low battery indicator features. Field recalibratable. Operates on AC adaptor (included) or 4 AA batteries (not included). NSF listed. Overall size: 6.1" x 8.5" x 10.4"
Close-up view of the front $145 (+3 lb ship wgt)