Holmarc offers the comprehensive collection of impedance tube system, Which includes hollow tubes, Microphones, Daq unit, Sample holders and measurement software as per international standards. The The tube has been crafted using anodized aluminum to measure sound absorption coefficient and transmission loss as per test standards described in iso 10534, 2, Astme1050 & astm e2611 at that is, Normal incident, 0 . The measurement is founded on transfer function method which separates the incident and reflected energy from the measured and then, Transfer function estimates the acoustic properties of the test sample. The properties measured with this test method are useful in basic research and product development of sound absorptive materials.