Hydrometer marked O or W at top, M at 32, 45 at bottom of stem scale
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Hydrometer marked O or W at top, M at 32, 45 at bottom of stem scale, result 1 of 1
Now viewing Hydrometer marked O or W at top, M at 32, 45 at bottom of stem scale
Now viewing Hydrometer marked O or W at top, M at 32, 45 at bottom of stem scale