This item was purchased to test if my current oxygen regulator is working properly. I had a much more expensive oxygen regulator and the last time I used it my oxygen tank was empty or my regulator was not working properly. The price of this device was quite affordable for troubleshooting. I found my old regulator had failed and still had gas in the tank to do some more work. The price of this controller is in an affordable range. I don't know how long it will last, but it definitely works.
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