The name on the sticks I use is TEMPILSTIK, I also have an 8 position pyrometer then I purchased the $25.00 dollar Harbor freight point and click like the one used to check the temperature of the pythons in Florida, at one foot away it is off about 2%, again heat travels, up close the ambient heat around the heated case could melt the plastic.
So assuming I determine heat by color is OK, one day someone will determine the temperature of heat travel down the case while it is being annealed,. On the Internet there are claims of annealing with a candle while the case is being held in the hand with the rational, when the case gets to hot to hold in the fingers it's done, other claims, I use a holder because the head of the case gets too hold to hold by the fingers? Then there is the link to u-tube, the narrator gets up in front of the camera and becomes the authority of annealing, he says "They say,,,,,,,,, do not listen to them because it is not important....they are wrong" for those that are watching and listening and are not dunces they will notice right off he spends too much time looking at it., he needs a bigger torch then we come back to where we started, All I want to anneal is the neck, sometimes that includes the neck, shoulder and part of the case body when forming cases from work hardened brass (fired more than once) when I do not want to use new bras, in the perfect world when forming brass new cases are used, I do not mean sizing a case, chamber and then pull the trigger, to me that is fired brass, not fire formed brass, again I form first then fire.
I control heat travel and the time I spend looking at it.
http://www.industrial-needs.com/measuring-instruments/pyrometers.htm
F. Guffey