Profile: Apex Control Instruments manufactures calibration test equipment for calibration and testing of precision pressure gauges, transducers, vacuum gauges & other pressure sensitive equipment used in the industry. We manufacture and supply testers to a large number of industries. Our products include dead weight pressure gauge testers, comparison type pressure & vacuum gauge testers, and pneumatic operated dead weight testers. Our dead weight pressure gauge tester is used for calibration of pressure gauges and other pressure sensitive instruments over a wide range of pressure. It is of robust construction and at the same time extremely accurate. This instrument is supplied complete in all respects and in ready to use condition for the calibration of pressure gauges. Our comparison type pressure and vacuum gauge testers find application for testing & calibration of pressure & vacuum gauges, transducers & other pressure/vacuum sensitive instruments for comparing the gauge with a standard test gauge. Our pneumatic operated dead weight testers are ideal for the calibration of low pressure test gauges, depth measuring devices, D.P. cells, and other pressure sensitive instruments. The operation principle of the pneumatic tester is similar to oil operated dead weight tester except that air is used as the operating medium in this case. We also manufacture combined pressure & vacuum gauge testers, oxygen gauge oil-seal, and liquid column manometers.