Thermal units range in price from around $1,000 for basic thermal viewers to over $7,000 for the most sophisticated rangefinding scopes. Keep in mind that these aren’t night-vision units, which can cost only a few hundred dollars. Thermal scopes depend on a rare-earth element called germanium, which supplies temperature-sensitive glass for thermal units. Generally speaking, the best combination of attributes, capability, and overall utility of thermal units will set you back around $3,000.