Protimeter Heavy-Duty Hammer Electrode - BLD5055. Designed to take moisture measurements at depth in wood up to 1.5 inches (40mm). The pins are insulated and will take measurements at the tip of the pin, providing the insulated coating is in good condition. The Protimeter Heavy-Duty Hammer Electrode is suitable for prolonged, regular use with the following Protimeter pin-type moisture meters.Protimeter MMS2 Mositure Meter (GE-BLD8800). When used with any of the above moisture meters, the Protimeter Heavy Duty Hammer Electrode is able to measure the sub-surface moisture levels of wood, wooden structures and products at greater depths.