My device has never worked as I expected. I bought a used Fluke mesg tester on ebay and have never been happier. I have my original ANPDR-77 flow length meter from when I was in the US Navy in the late 80's and apart from a one time overhaul due to battery leakage it still works. I've learned to buy the best quality tools you can afford and take good care of them because they will likely last you a lifetime. Unfortunately, I didn't have that feeling with this product.
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