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Infrared Moisture Meter Infrared moisture meters are divided into two major categories: infrared heating loss-on-drying type (laboratory benchtop) and near-infrared spectroscopy type (online/handheld, non-contact). The principles of the two are completely different, and many people easily confuse them. I. Two Principles 1. Infrared Heating Moisture Analyzer (Thermogravimetric Method) A benchtop laboratory instrument, similar in principle to a halogen moisture analyzer, with the heating source being an infrared lamp or infrared tube. Principle: Infrared radiation heats the sample, causing water to evaporate, and the built-in balance measures the weight difference before and after heating to calculate the moisture content. Testing time: 315 min. Advantages: low price, simple operation;