Lenk Soldering Pencil For Soldering Jewelry, Mosaics & Metals. This is a new lenk soldering pencil. It is perfect for fine jewelry work. It melts solder in 90 seconds with a tip temperature of up to 900 F. The efficient mica insulated, nichrome heating element gives more stable tip temperatures and longer element life. The handle gives better control and handling when soldering. This tool includes a holder and instructions. It runs on 25 Watts, 120V. It measures approximately 8 1/4" (209 mm) long.