Portable Ultrasonic Tester Market – Growth, Trends, COVID-19 Impact, and Forecasts (2021 – 2027)| Sonatest, Sonotron NDT, GE, Karldeutsch, Proceq, Zetec, SONOTEC GmbH, Centurion NDT, Nova Instruments(NDT Systems), Hitachi Power Solutions, Modsonic, RYOSHO, KJTD, Novotest, Dakota Ultrasonics