... light: small size,little volume,easy move.3.low maintenance cost: no fragile, expensive tubes;4.special security, no pressure, eliminating the high ... power and water, and 10 minutes to complete.;7.easy operation :a few minutes to learn. Application: 1.Auto parts: ... the temper of pontil, the hardening of surface for high tensile screw, epoxy powder coating for locking nut etc. low price of induction heat ...