Greetings,
Like any "instrument/guage" one tends to record trends. I purchased a Harbor Freight unit and it seems to be working fine these last 3 years. Now as to determining the levels in your tanks??
Yup, just checked, just keep the button on for continuous read. One thing to consider is to keep the unit the same distance from the objects you are trying to measure. There's some difference.
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RTF
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