DON’T WE NEED TESTEX TAPE FOR ACCURACY?
Here’s the question for today. “Why would we use a Surface Profile Gauge versus Testex Tape?”
It can be puzzling because we believe with Testex Tape, we’ll not only get an accurate reading, but also a permanent reading we can keep if we later need proof of the profile. And that is absolutely true. But that’s also now the case with a surface profile gauge.
Let’s start with accuracy. The new DeFelsko gauge processes what is called a smart batch – which conforms to the SSPC-PA 17 requirement for the number of measurements that may be taken to qualify an area. The smart batch gives you a maximum of 10 readings.
You can see in the lower animated gif, the Gauge will take 10 readings and from that batch, it will choose the appropriate profile for that batch. This is exactly how Testex Tape works. The Testex Tape uses the highest peak and the lowest valley to determine the profile.