The 3 place multi position (extraction) mantle has a built-in electronic controller and offers a choice of heater only (HM-200) or heater/stirrer (SHM-200) combination.rThe vented case's unique air flow ensures the outer case remains safe to touch.rr- Top cover is polypropylene and external surfaces are powder coated giving good general chemical resistancer- Coiled heating element is suspended within a thermal insulating cartridge to provide maximum heat transfer and supportr- Earth (ground) screen encloses the heater for added safetyr- Individual heater cartridges are replaceabler- Neon lights indicate when power is on and supplied to heaters and, if applicable, supplied to stirrersr- Three 12.7 mm diameter support rods are includedrrFor models with agitation:r- Allow the solution to be stirred and heated simultaneouslyr- Provide stirring speeds of between 50 to 1000 rpm r- One stirring control operates each set of three recesses