Pegasus Astro DewZap Dual Channel Dew Heater Controller (DEWZAP)

Highly recommend

Small, lightweight, efficient, works as advertised.

Pegasus Astro DewZap Controller

Works like a charm. I use it to connect to a Kendrick Optical Tube Heater element for a 9/10 inch telescope. For improved mobility, I plug in a 12V DC/10A power supply to a portable lithium polymer power source, no extension chord needed.