PVC filter monitors from Orange Research accurately alert operators when it is time to clean or replace filters for water and corrosive liquids, and can save hundreds of dollars over the life of a system. Popular in water treatment systems, the monitors are available with one- or 2.5-inch (25.4- or 63.5-mm) diameter durable plastic dial cases. Switches are standard options to alert users of alarm conditions. PVC bodies are rated at up to 150-psi line pressure and are compact, measuring 1-in. D x 1.5-in. H x 1.5-in. W (25.4 x 38.1 x 38.1 mm). Precision-made piston sensors handle differential pressure ranges from 0-10 to 0-30 psid, covering most filter monitoring applications. Accuracy is five-percent full scale and each unit is calibrated to NIST standards. http://www.orangeresearch.com, info@orangeresearch.com