Jacoby-Tarbox®, founded in 1914, offers the world’s most extensive line of sight flow indicators and sight windows. The original US manufacturer of sight flow indicators is manufactured by the Clark-Reliance® Corporation. Our sight flow indicators and sight windows can be used to verify process conditions throughout piping, vessels and other equipment, whether the process is liquid or gas. When you select Jacoby-Tarbox, our experienced and dedicated representatives work with you to incorporate newly developed options or apply trusted standards in new ways to maximize the duty cycle of your units in nearly every combination of pressure and temperature in your process. Get positive indication of flow or other material properties, such as color, change in state, or simply material presence while in any orientation. We can find the best solution for you.