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Is there a good way to test pepper spray pressure? If you wish to test your canister for pressure, make your spray burst only a fraction of a second and don't do this often, as there may be as little as four seconds or less worth of spray in some models. The label or instructions of a good brand should tell you how many seconds of spray it has. Although floating the device in water to determine the quantity of ingredients left has been recommended in the past, be aware that this may cause the label to fall off or dissolve, and the device will no longer comply with the pepper spray law unlabelled.