I HAVE 4 METERS MILLIAMPERES D.C. - 5 UNITS DB ABOVE 59 - TUNE FOR MAX - OXYGEN FLOW INDICATOR, I GOT THEM AT A AUCTION AND DON'T KNOW ANYTHING ABOUT THEM, SO YOU ARE BUYING AS IS. CHECK MY PICTURES OUT AND IF YOU HAVE ANY QUESTIONS I WILL TRY TO ANSWER THEM.
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