Acorn Naturalists offers an array of field thermometers, including the rugged Enviro-Safe® brand NIST-certified thermometers that do not contain mercury, mineral spirits, or alcohols and thus are ideal thermometers for use in the field. Also in this section are pocket thermometers and remote probe thermometers (for recording temperatures in microclimates such as inside small animal burrows). Extra long composting thermometers are also found here, useful for studying temperature change in compost piles as a function of the amount of nitrogen added to the mix (nitrogen acts as food for the bacteria, causing them to "bloom" and heat up the compost as a result of breaking down the organic matter).

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