Glass-Col offers its standard series TM mantle for round-bottom flasks with the PowrTrol power control as a special, economical package. The PowrTrol is a solid-state, proportional-voltage control that provides precise manual control of the output range, which is adjustable from 5-100%. The standard series TM mantle is for round bottom flasks from 50 mL to 5,000 mL in both 115V and 230V where available. The mantles are designed to withstand an internal operating temperature of 450deg C and are CSA certified.