You might be one of the lucky roasters who gets perfect readings from your meter. However, some don't. Mostly spikes are caused by some electrical interferences between the temperature probe, meter or Computer. In the ideal word those should be resolved by an improved hardware setup. A nice description of the issue and a documentation towards its solution was recently posted to the HomeBarista forum and also a newer post details on a solution. However, in some cases a physical solution is not possible for various reasons. In those cases the new spike removal features of Artisan might help you out.
