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One AA battery and pen.
The PW4 weather-resistant pressure recorder is housed in a durable NEMA 4X case. These lightweight 4" or 8" recorders provide protection against corrosion, windblown dust and rain, splashing water and hose-directed water. Note: PW4 & PW8 Pressure Chart Recorders are not suitable for monitoring ammonia, acids or other corrosive substances.
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