The Elcometer MTG4 Ultrasonic Material Thickness Gauge (part numbers MTG4 gauge only and MTG4-TXC with transducer) is an ultrasonic gauge for taking thickness readings on a wide range of coated and uncoated materials. Ultrasonic thickness testing is a non-destructive method used where only one side of the material is accessible, such as pipelines and storage tanks, making the MTG4 suited to monitoring corrosion and erosion across steel and many other substrates without cutting the material.

In addition to Pulsed-Echo (P-E) mode, with a thickness range of 0.63 to 500 mm, the MTG4 offers Echo-Echo ThruPaint (E-E) mode over a range of 2.54 to 25.40 mm. In Echo-Echo ThruPaint mode the coating thickness is ignored and the gauge displays the material thickness from the top surface down to the material density boundary, so coated components can be measured without removing the coating. The velocity range is 1250 to 10,000 m/s and accuracy is plus or minus 1 percent or plus or minus 0.1 mm, with a pre-set measurement rate of 4 Hz selectable up to 16 Hz.

The Elcometer MTG4 Ultrasonic Material Thickness Gauge adds calibration flexibility over the entry level model: zero set using the integral zero disc, 1-point calibration against a sample of known thickness, a choice of 39 pre-set materials including aluminium, steel, stainless steel, cast iron, plexiglass, PVC, polystyrene and polyurethane, and a factory reset. It uses a dual element transducer with automatic transducer recognition and V-path correction. The MTG4 is tough, waterproof and dust resistant to IP54, with a 2.4 inch TFT colour screen, ambient light sensor, emergency light and tap awake from sleep, and carries a 2 year warranty. Individual readings download via USB and gauge software updates come via ElcoMaster software. It conforms to ASTM E797, EN 14127 and EN 15317. Used in NDT, corrosion and coatings inspection, and supplied by BAMR, South Africa's authorised Elcometer distributor.