Make a Cloud Chamber using Peltier Coolers

Step 3 Stuff You'll Need (Part 3)

1/4" x 1" nut + bolt (size doesn't really matter)

1" x 1" piece of kitchen sponge

Styrofoam cup (or other static source - a balloon also work well)

Infrared / non-contact thermometer (optional)
- Optimally can read to at least -28f
- Cen-tech Pocket Thermometer goes for about $20 on ebay
- Cheaper ones may give erratic results

Multimeter (optional)
- For verifying power supply polarity / troubleshooting