This general purpose ultrasonic couplant gel holds on to horizontal and overhead surfaces. The R7950 is designed to work with ultrasonic thickness gauges and is ideal for iron, steel, aluminum and titanium surfaces. REED R7950 Offers Features 8.45 fl oz (250ml) applicator top bottle Slow drying with good transducer lubrication Water soluble Includes applicator bottle Material Safety Datasheet (MSDS) available upon request Included REED R7950 Ultrasonic Couplant Gel