Magnavis® 7HF BK Visible Magnetic Particle Wet Method Prepared Bath, 16 oz Aerosol no checkout and spot checking of stress and spot checking of stress susceptible machinery Does not require additional equipment to provide visible indications under normal light conditions electrodes are packed together with swirl ring holder (black part) in ratio 5 electrodes to 1 holder Designed for spot inspections of parts that must be inspected in the field due to size or location Composed of Magnavis® 7C Magnaflux magnetic powder suspended in a low volatility mineral oil Suitable for inspection of tubes piping and other large structures