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I have one and found a time I needed it. The shops analyzer broke and if I didn't have mine there would have been no fill.
If you own steel cylinders you NEED one, or don't dive those cylinders. You don't even need Nitrox in it, get some water in it and you may find your O2 levels so low that they won't support life.
A university did a study with a steel cylinder and a cup of salt water. In 60 days it was low enough that you could not survive on the air in it. There has been a few diver deaths attributed to low O2 in a cylinder due to rust in it.
So, to me, if you don't dive all the time, if you store your steel cylinders for 6 months without refilling it, then you need an analyzer for your own safety, even if you don't get Nitrox fills.
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Matthew P. Cummings
Moberly MO
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