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Most drug stores sell the electronic ones that take their reads fast. They're not very expensive and pretty accurate. The good ones can be used underarm (Axiel?), Oral, or anal and suggest 'adjustments' for the underarm readings. I also have one of the IR, ear units, but you have to hit those JUST right anbd verify the measurement a few times in each ear. However, they are fast, but a bit expensive.
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