Performance-oriented cyclists tend to focus on the weight of their bikes and components, and the Alpine Scale from Feedback is the best way to measure. Simply clamp it into your workstand to make weighing bikes, wheels, etc. a snap - it's the first scale designed (and patented) to work this way. You can also lift it by the included loop for weighing smaller items.
The Alpine Scale is found in many professional shops because it is precise, accurate, consistent, and switches quickly between pounds, ounces, grams, and kilograms.