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"Astronomy Earth Science Models"

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Economy Dissolved Oxygen Meter

Item Number:  (470012-452)
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This user-friendly meter has a long battery life and plenty of helpful functions.

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Soil pH Meter

Item Number:  (470104-844)
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Simple read out.

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Advanced pH Meter Kit, Sper Scientific

Item Number:  (470204-174)
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Reads either pH (in 0.01 resolution) or mV in large digits, with time, date, and temperature (in °C or °F) shown simultaneously on the lower display.

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Extech® Waterproof Palm pH Meter with Temperature

Item Number:  (470350-914)
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This palm-sized pH meter with cabled electrode can measure pH, voltage potential difference (mV) and temperature.
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