The PosiTector UTG instruments are handy Ultrasonic Thickness Gauges as Standard or Advanced Models. Both available with a selection of 2 probe styles, UTG C – Corrosion Probe for measuring the effects of corrosion and erosion on tanks, pipes or other structures which only can be accessed on one side or UTG M – Multiple-Echo Probe to measure, non-destructive, the underlying metal (material) thickness to be measured on objects that are already provided with a coating.