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Everyone else hears "grain depression" and gets worried about you. You hear it and check your dehu readings. When GPP out is lower than GPP in, that's a good day on the job, no matter how many after-hours calls got you there.
The back carries a clean, stylized psychrometric chart in blue and green, with a sharp downward arrow labeled GPP OUT < GPP IN. GRAIN DEPRESSION sits above it in distressed stencil block, with THE GOOD KIND in smaller caps below. It's a badge of competence for water techs and drying PMs. If somebody has to ask, they don't run the readings.