Introduction The ETT-0681 Portable Light Transmission Meter is mainly used to test the transmission of automobile glass and transparent or semi-transparent objects. It is small in size and portable, so it is especially adaptable to field measuring. II. Application Automobile making and test, field measurement of glass products and aerospace industry; Measurement of the transmission of glasses, sunglasses and anti-suntan protective films; Measurement of the transmission or haze of plastic products; Measurement of the transmission of other transparent or semi-transparent materials Specification Range of measurement: 0.0-100% Measuring quantity: % optical transmittance Maximum matrix thickness: 10mm Measuring accuracy: ≤2% Ambient temperature: 5-40℃ Relative humidity: ≤85% Air pressure: 860-1060hPa Accuracy range: 5%~85%visible light transmittance Optical detector: complying with V (lambada) human eye sensitivity