OptiShield II Plus corrosion inhibitor has been specially formulated to provide corrosion protection in systems such as laser, welding, induction, and other equipment where "electrical conductivity" of the fluid is of concern. The lower conductivity of OptiShield II Plus allows it's use in some systems where protection is not otherwise available due to system/fluid conductivity specifications. OptiShield "II Plus" provides the same corrosion protection as our OptiShield II formula but contains an additive to provide additional protection.