How to read Temp Tape?

I have kind of a dumb question and cant seem to find the answer from searching this forum or google.

How do I read my temperture tape on the outside of my Carboy?

I have a dark blue block that says 64, a green block on 66 and a red block at 68, all other blocks are blacked out. Do I go with the green? Is my batch sitting at 66 degrees?

Or maybe my tape isn't working properly? Any help would be great. Thanks!

I go by the middle number.

From Google: http://tkachenterprises.com/Products.html

The instructions that came with mine said read the 'greenest' number as your temp.

I also have a question about tape thermometer. Is it an accurate temp of the brew? Or, is it reading air temp, or a mixture of air and beer temp?

f one crystal is highlighted in green, it is that temperature. If two adjoining crystals are highlighted in blue and tan, it is the temperature in between.

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Like I said...

Good stuff, thanks alot guys. Happy Brewing

hd4wes said:

I also have a question about tape thermometer. Is it an accurate temp of the brew? Or, is it reading air temp, or a mixture of air and beer temp?

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In my (limited) experience, it's the temperature of the beer/wort at the edge of the container. When the beer is fermenting, the middle of the bucket is going to be warmer.

IffyG said:

In my (limited) experience, it's the temperature of the beer/wort at the edge of the container. When the beer is fermenting, the middle of the bucket is going to be warmer.

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I doubt the middle would be much warmer while fermenting due to aggressive mixing. Afterwards maybe.