Western Optical's Basic Bead Box Frame Warmer (a.k.a. salt pan) is designed to heat glass beads
or salt for easier and safer zyl frame mounting. The Basic Bead Box Optical Frame Warmer is an economy version of the Hot Box Frame Warmer
. The 2550 has a preset 350 degree thermostat. There is no On/Off Switch. Simply plug it in for the day. Temperature is adjusted by varying the height of your glass bead fill. This Basic Frame Warmer is an effective, low cost optical dispensing tool.