What is
Sorption curve: water activity and moisture content
Meter working principle ( one of many methods)
Hair hygrometer to measure relative activity
Diy using digital hydrometer
Aqualab: Role of Water activity in coffee , ie molding, or mycotoxins
Primecoffea, helenacoffee is quoting misleading SCA figures from SCA's "washed arabica green coffee defect poster". But i think this is general guideline, rather than the rule, or standard.
ICO: different export countries have different national quality standards
Eg Colombia: <12%
Rwanda: 10-12.5%
Uganda: <12.5%
Italy: <13% (incoming)
China: <12%
SCAA: 9-13 % from FAO, coffeeresearch
Unified Grain Moisture Algorithm (UGMA)
Reference:
Sciendo impact of the roast level on chemical composition of coffee from colombia
Sciencedirect ISO1446, ISO6673 (105 deg c, 16 h, 1 ATM)
Moisture content of soil ASTM-D2216 YouTube
Rotronic webinar
Hacking capacitive soil moisture sensor based on TLC555
Yet another instructable based on LM393
theblinkingman plant watering project , github based on Si5351
Aquamatic 5300 using 150 MHz
Draminski using 4 frequencies
Researchgate frequency selection
UGMA , design criteria, compliant testers
Stripline cell , 149 MHz
Jircas.jp , 10k to 10 MHz
Soil Capacitance probe
Test cell dimensions
coffmeter M1 is 41.5mm diameter
Lebrew roastsee 105mm dia
Other Chinese brand 71mm
Agratronix: 64mm (2.5 inch)
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