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Http:www.channeleco.comenitemshow.asp?m=1&d=1197 product description� qt-at 502 chlorophyll meter can measure chlorophyll content of plants. Chlorophyll content is an important index of plant growth. This instrument is powerful, portable, and easy to use. It does no harm to plants. Users just need to put a leaf tissue larger than 3mm in the aperture, and then press the button to get the chlorophyll content reading.
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