Profile: Styrax Instruments India Private Limited is a manufacturer and supplier of door interlocking systems, security systems, access control systems, sensors & process measure control systems. Our products include push button stations, electromagnetic locks, electric strikers, static pass box controllers, dynamic pass box controllers, air shower controllers, access controllers & readers, clean room process monitors, differential pressure indicators, and synchronized digital clocks. Door interlocking system is used to control the entry of personnel to a secure area such as a clean room, where dust or small particles may be a problem. The principle is generally well under-stood. In its simplest form, the door interlocking is composed of 2 to 12 doors that are electrically interlocked in such a way that the all doors cannot be opened simultaneously. The door interlocks are used in a variety of situations but in essence they are there to control the unwanted passage from one area to another. Differential pressure indicator is specially designed to indicate the pressure difference between two different areas. Two alarms can be selected for above or below set point control, which can help the user to monitor the DP and to take necessary actions to maintain the room conditions as per the requirements or applications.