This article is already 20 years old, nevertheless RedWolf Airsoft reposts this article on using a Coke Can for a Poor Man's Chronograph if there is no chronograph available to use... "Not everyone can afford a chronograph to test how much juice their favorite airsoft pistol or AEG has. Even after lots of modifications you wonder how much velocity you're really getting. Well you don't necessarily need to dish out several hundred dollars for a chronograph. In most cases, a simple soda can is all you need to gauge those major power milestones.

Running of Coke cans to use a targets whilst doing backyard plinking or for target practice? Here is APS to the rescue as they announce the APS Coke Can-Style Reusable Targets with five targets to choose from and in bright red colour for easier spotting. Too bad you cannot them use for a "poor man's chrono".