Shoulder type Model 915 is for use on thin film coatings. It has infinite voltage settings over a range of 1,000 to 5,000 volts. This detector automatically converts from DC to the fast pulse mode when moisture on the coating is encountered.
Models 915 and 925 incorporate all of the features and capabilities of the corresponding Model 715 and 725 detectors. Shoulder models with flat brass brush electrodes are especially suited for "spark testing" coatings on tanks and flat surfaces.