At the 2002 Annual Meeting of the International Down and Feather Bureau (IDFB), the method of detecting down turbidity (transparency) with a dedicated turbidity meter was approved as the official IDFB standard. The US-made LM 2020 turbidity meter (NTU) has become an IDFB-designated transparency testing instrument. 【Relevant Standards】

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【Scope of application】: At the 2002 Annual Meeting of the International Down and Feather Bureau (IDFB), the method of detecting down turbidity (transparency) with a special turbidity meter was approved as an official IDFB standard. The US-made LM 2020 turbidity meter (NTU) has become an IDFB-designated transparency testing instrument. 【Instrument Characteristics】： 1. Waterproof grade IP67 2. Rechargeable lithium battery 3. USB interface 4. 7 languages 5. EAP and ISO optional 【Technical Parameters】： 1. Measurement standard 2020we: NTU, AU, ASBC, EBC 2,2020wi:FNU,FAU,ASBC,EBC 3, Range 0-4000NTC/FNU, 0-10,500 ASBC, 0-150EBC 4, Resolution 0.01NTC/FNU 10.00-10.99 5,0.1NTC/FNU 11.00-109.9 6,1NTC/FNU 110-4000 7. Accuracy From 0-2.5NTU the accuracy is ±0.05NTU 8,From 2.5-100NTU the accuracy is ±2%NTU 9,From 100NTU the accuracy is ±3%NTU 10, detection limit 0.05NTC/FNU 11. Range selection Automatic 12. Light source Tungsten (EPA) complies with EPA 13,180.1 Standard 860 14,LED(ISO) complies with ISO 7027.