Review on DecentGadget® Ultrasonic Thickness Velocity 1 2 225Mm by Mark Powell

When I received the first unit I tried the sensor(s) that came with it. I put in new batteries, connected the sensor and calibrated on the device according to the instructions on the calibration disc. Then I changed the speed of sound to a material I was familiar with (a metal rod with a perfectly flat surface) with a thickness of 1.6mm. The reading changed every time I placed the transducer on the sample, sometimes reading 1.6mm (the correct value), sometimes 3.2mm (twice the actual thickness of the sample). I've tried many times, checked that enough adhesion promoter was applied, recalibrated several times, but the problem of inconsistent readings persisted. In an attempt to correct the error, I took a different gauge from another thickness gauge I had in the lab. (same transducer model) connected to the thickness gauge and calibrated. With this other transducer the instrument now worked perfectly, no erroneous readings, it always read the correct thickness of 1.6mm every time I placed the probe on the metal rod of the sample. an error was returned with an erroneous display of twice the actual sample thickness of 3.2mm. So at this point the meter seemed fine, but the converter that came with it was defective. So I asked the seller to replace the converter. After 2 weeks I received a replacement converter which had the same problem. At this point the seller stopped responding to my emails so I contacted Revain support. They wanted me to return the entire device with the faulty sensors and sent me another new device to try before issuing a full refund, which I did. Now I got a new device with a new sensor, tried it on the same sample and I still have the same problem where it happens to show double the actual thickness. Therefore this item is being returned for a refund and I will definitely never buy this model again. The fact that the gauges themselves have always worked fine while all the sensors seem to have issues makes me wonder if the sensors are probably the most expensive part of the device and they just used out of spec/rejection sensors around they reduce the cost. Bottom line: these sensors aren't worth the hassle, buy something else, especially if you're going to use them to measure something you don't have any other means of confirming the readings.