Miniature differential pressure instruments offer an economical alternative to full-size gauges and can be direct-mounted on filters, pumps, tanks, fluid lines, and similar equipment, says the manufacturer. The instruments are available in several styles, including standard dial-pointer gauges, differential pressure switches, gauge/switch combinations, and special designs that indicate changing delta-P on scales visible from any angle, the company says. Switch models allow users to activate alarms or control processes at predetermined setpoints.