Quote Originally Posted by lasersbee View Post
I agree with this statement....
There are basically 2 types of Thermoile sensors the Radial Thermopile type
such as the OHIR 20C-A and the Waffer Thermopile type similar to what is
used by the Laserbee products.
As far as I'm aware all the "big" companies use the radial thermophile.

I think this is because changes are faster noticable (very thin area to heat up) so its much better for tuning lasers.