dont be a confused nightcrawl ;)
hopefully HKJ can chime in and tell you more about it.
in short, 99.9% exact current (amperage) measurements at low operating voltages by the help of a single (cheap or expensive) DMM are still a great challenge in technology and engineering. clever circuit aids have been devised by HKJ, David Jones, et al. to circumvent the inherent difficulty of the task. if you do not buy such clever circuit aids, then you get the most truthful amperage reading by setting your DMM to the high amperage range (1A...10A) in place of the low amperage range (1mA...1000mA) --- this tip applies to our purposes: tailcap readings on flashlights at low operating voltages.
EDIT: HKJ beat me to it. hehe.