For convenience, I've divided the belay devices in my collection into a number of categories. Although there are more rigorous methods to classify belay devices, I've chosen an informal approach that I think will be easier for most people to follow than some purely academic method.
The tables include some numerical data:
|ID||This is just my catalog number so that I can keep these straight|
|Weight||Weights are in grams. Webbing, slings, etc. are not included unless they were supplied with the device. There is an exception: I put a 3 mm. keeper sling on many of my belay devices, and its weight is included.|
|Height, Width, Thickness||I've given the dimensions in millimeters. The measurements are in perpendicular directions. I've chosen to measure the maximum dimensions instead of the most obvious dimensions. Sometimes this leads to numbers that are more than what you would expect - for example, the thickness of a bent plate would be more than the thickness of the unbent plate.|
|Standard Volume||The standard volume is just the product of the height, width, and thickness divided by 1000. This gives a volume in milliliters of a box that the device will fit into. Odd shaped devices are penalized by this formula, but since they are generally harder to pack, this number might be useful.|