a.YH620 Ultrasonic Range Finder Distance Estimator b.Measure range: 0. ... diode 650nm d.Calculate area& volume YH620 Ultrasonic Range Finder Distance Estimator * Product InformationUltrasonic Distance Estimator YH620Features:* ... Calibrator, Digital Infrared Thermometer, Digital Multimeter, Clamp Meter, Digital Power Clamp Meter, Environmental Meter, Eletrical Testers, etc. * Relative Products * ...