Hall flowmeter is a kind of dry powder or bulk powder flowmeter. It is different from other flowmeters. It can ‘t measure air or liquid’s flow rate. It is a laboratory instrument that can only measure the flow rate of powder. HMKTest is the world’s leading producer of hall flowmeter which not only produce manual hall flowmeter but also produce full automatic hall flowmeter. The measurement is more reliable and the repeatability is better, which is recognized by a large number of customers.AS-300A Automatic Hall Flowmeter by HMKTest.