As with most things in the world of science, a complete out of the box solution comes at a premium. This Instructable shows how I assembled a temperature controller for our objective with relatively cost effective parts. Another description for how I made this setup can be found in my Open Notebook Science Dissertation.
This build relies heavily on the work done by:
Mahamdeh, M., & Schäffer, E. (2009). Optical tweezers with millikelvin precision of temperature-controlled objectives and base-pair resolution. Optics Express, 17(19), 17190. doi: 10.1364/OE.17.017190.
As was suggested in the comments below, I'd like to add in this step how my interactions went with using TeTech during this build. As any scientist/researcher will know, companies that sell scientific equipment can be difficult to deal with at times. This was not the case when I was dealing with the customer support with TeTech. They were always informative and responsive and were willing to lend advice when ever I spoke to them or asked questions. They are by far one of my all star companies that I actually enjoy dealing with and would greatly recommend purchasing items from them to anyone.
If you would like to site this build in a publication, you can use the following citation
Maloney A, Herskowitz LJ, & Koch SJ (2011) Effects of Surface Passivation on Gliding Motility Assays. PLoS ONE, 6(6): e19522. doi: 10.1371/journal.pone.0019522.
Step 1: Materials & Tools
1x Polyimide Film Heater Kit (Omega KH-KIT-EFH-15001). I personally like the kit version mainly because there is a ton of things you can make with the other heating elements and it is not that much more expensive to get the kit.
1x Copper tape. I used copper tape since it was what I had lying around. However, you can also use aluminum tape as this is what is recommended by TeTech to use with their thermistors.
1x Power supply (TeTech PS-12-8.4). I have never had a problem using MeanWell power supplies and I rather do like their ease of use.
1x Thermal spacer (Bioptechs RMS - 152019R). This part is with out a doubt the most expensive component for this build. Especially since it is nothing more than a piece of ABS plastic with RMS threads on it.
1x Temperature controller (TeTech TC-48-20).
2x 15kΩ thermistors from TeTech (MP-2444 and MP-2996).
1x Bud Industries aluminum box (AC-403) and bottom plate (BPA-1591).
2 LEDs (Yellow and Green). Any will work. I didn't use these exact ones but I wanted to include a link.
2 switches. I used one toggle switch and one rocker switch.
2x Black Banana Jack
2x Black Banana Plug
2x Yellow Banana Jack
2x Yellow Banana Plug
2x Orange Banana Jack
2x Orange Banana Plug
2x Blue Banana Jack
2x Blue Banana Plug
1x Green Banana Jack
1x Green Alligator Clip
1x Red Banana Jack
1x Red Alligator Clip