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<p>[QUOTE=&quot;afantiques, post: 78436, member: 25&quot;]The first one appears to have a barometric read out, calibrated in cm. of mercury. Try putting it in a large clear plastic bag, holding the bag airtight (more or less) shut and squeezing the bag. The needle should mover to a higher reading.</p><p><br /></p><p>The other I cannot see enough of to determine. It may be some form of hydrometer.[/QUOTE]</p><p><br /></p>

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