aa battery
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hydrometer 

FCCDFEd said:Hey like the pics, must be using that new camera. Don't most hydrometers have a squeeze bulb to bring the water up in to a main glass tube. That piece looks like the interior floater that measures the battery strength.
Could be wrong. Just a thought.
NOLA_Ken said:I think you might be right.....looks like one to me anyway.
ya know we were givin this item plus sum old camera equipment. sounds about right.rjs123 said:I am a wet plate collodion photographer. I shoot tintypes, ambrotypes and glass negatives with 19th century equipment and I use a similar hydrometer to measure the silver nitrate content of my silver bath. Hydrometers are used to measure the specific gravity of liquids.
The temp correction note also IDs it as HydrometerAKiwi said:DCMatt has hit it on the head.....I have been home brewing for 21yrs now and that is a hydrometer as to calculate the % of alcohol in beer/wine or the amount of sugar to add to the must as to gain a certain % of alcohol.
Cheers