Heaters with Dial Temperature Controller have a sensitivity of ±1°>F when liquid is stirred. Top-mounted pilot light indicates that heater is on. Choose from four styles "A" loop, "B" short rod, "C" flat, and "D" long rod which is the same as style "B" only longer. Heaters feature a plastic grip handle; and a 6-ft, three-wire cord, 115 VAC models have U.S. standard plug, 230 VAC models do not have a plug.