Telrad dew heater by MoonLite. 12 volt 2 watt plastic unit snaps into place on your telrad and keeps all optical surfaces clear even in the most severe conditions. Plugs into your existing 12 volt battery or any brand dew controller, low current draw too! See URL to order on-line. $21 and always in stock. Ship same day using USPS Priority Mail.
This is a must for telrad owners!