#ndt Dual element transducers need to be tough. They’re routinely used on many types of surfaces, ranging from rough to reasonably smooth, painted to corroded, and freezing to very hot. Even though they’re tough, they’re still subject to wear.

You can prolong the life of your transducer by making sure that you’re applying the least amount of pressure possible when making measurements. For example, if the surface is so rough that it’s difficult to obtain a reading, grinding the transducer into the surface prob
Source: NDT