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Overview

The Drycard is an affordable device invented by the University of California,Davis in USA  that enables small-scale farmers to measure the moisture content of their produce and therefore prevent mold growth and post-harvest losses.  Retailing for below US $ 1, the Drycard is an inexpensive device for determining if dried food is dry enough to prevent mold growth during storage. The tool is intended for smallholder farmers who cannot afford the expensive moisture meters in the market. The Drycard does not need any batteries nor calibration to operate. To use the Drycard, the farmer simply places the Drycard and a sample of the dried product in an airtight container such as a sealed plastic bag or jar and after  30-60 minutes the card's indicator will display a measure of the equilibrium relative humidity. The farmer then matches the colour of the strip with the scale on the card. Pink colour on the strip means the product is too wet for safe storage while blue or grey colour means it is adequately dried.

 

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