Dew is an unpleasant problem at observing. The secondary mirror is relative small, and near to the end of tube, therefore it can cool down quickly. To avoid dew on the mirror you can use a heater.

Highly recommend to use as low heat power as it needed. In this case controller is not needed. 

Easy installation with applied tape, good heat transfer thanks to copper layer.

I can make it in 4 forms:
A - full, unshifted
B - full, shifted
C - splitted, unshifted
D - splitted, shifted

Necessary datas:
- mirror size (minor axis, thickness of mirror)
- diameter of mirror holder 
- supply voltage (3, 5, 12 etc.)
- requiered power (or calculated by me)
- requiered cable lenght
- requiered connector (USB, RCA, DC-plug etc.)
- form (A, B, C, D)
      - shift value at C and D

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