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All Grain Hydrometer
An Austin Homebrew Supply exclusive. This triple scale hydrometer is calibrated to 155 F (68.3 C). This allows for easy sampling directly from a mash tun. It is made from German flint glass so it can handle high temperatures. However, it should not be "shocked" or moved from very hot liquids to very cold liquids quickly.

Length: 8.9" (22.5cm). Range: 0.990-1.170.

$14.99

Check it out here.

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cadarnell

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thats pretty cool .. i think a free one to the first post is in order here ...haha

AnOldUR

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Had heard that hydrometers were not reliable at high temperatures. Is there anything different about this or is it a basic hydrometer with the scale adjusted?

Any different than using a standard hydrometer and a conversion chart?

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Complexity is good. Complicated is bad. -- Mosher

Beerrific

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Water's (and thus wort's) density varies with temperature. So a hydrometer calibrated at 60F for example would not be accurate for 155F. This one is calibrated for that temperature and, therefore, would not be accurate at 60.

Some conversion charts are better than others. Densities dependence on temperature is highly non-linear, so the conversion tables have to be made with care to accurately predict the density of a 155F liquid when calibrated at 60F.

Nice product. Not really in the market (I make do with a refractometer) but I think this will be an attractive buy for a lot of people.

kpr121

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I have heard than an issue with using a regular hydrometer in hot wort is that the glue that holds the paper on the inside can be melted, and then the paper falls, and its out of calibration. Is there any chance of that happening with this, or is that what the flint glass is for?

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badmajon

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I'm interested in this, AHS, please let us know in regards to the Qs.

BenS

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I'd be scared to "shock" it to quickly by taking a sample of the first runnings. I would buy a clear plastic hydrometer calibrated for 155F in a heartbeat though.

DustBow

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just keep it in some hot tap water before using it

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AnOldUR

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Non-linear, yes, but it is a predictable curve that depends on density decreasing as temperature increases. No conversion chart should be better than another. They are either right or wrong. The problem is that as the temperature goes up the rate of change in density is greater. This means that at 60 degrees a small error in temperature will not be significant, but at 155 degrees that same error will have a greater effect on the your gravity.

My question to Forrest is the same. Is this a more robust hydrometer made to compensate for the problems of measuring density at higher temperatures, or is it a standard hydrometer with the paper scale adjusted to read at 155 degrees?

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Complexity is good. Complicated is bad. -- Mosher