Company Profile


Founded in 1960, Security Instrument Corporation, a privately held U.S. Corporation, provides electronic security and life safety detection  and associated monitoring and support services.


Security Instrument offers a full line of services from professionally engineered system designs and turnkey installation services, to 24 hour system monitoring.

Service Area

Security Instrument is Delaware’s largest full-service independently-owned security and fire company, serving thousands of customers throughout Delaware, MD, NJ & PA.

Who We Serve

Our clientele is diverse and includes homes, small retail, jewelry stores, education, financial, chemical, pharmaceutical, precious metals, manufacturing, and more. SI continues to maintain its industry leadership position with a wide-range of technologically advanced products and services, delivering  comprehensive solutions covering all aspects of security and life safety requirements.

State Of The Art Local Monitoring

With Headquarters in Wilmington, Delaware, Security Instrument owns and operates it’s own state of the art UL listed Central Station delivering personalized, comprehensive, monitoring, information, and support services 365 days a year, 24 hours a day.

Knowledgeable, Professional Installation

Security technology, as well as the proper installation of its various components, can be fairly complex. Fortunately, Security Instrument is a locally owned  security and automation company headquartered right here in Wilmington Delaware, employing factory trained installation specialists that are knowledgeable, courteous and thorough.

Reliable, Leading-Edge Technology

We realize that our reputation and success is directly linked to the quality of equipment, service and support that we provide.  Security Instrument has maintained a controlled growth strategy that has allowed us to consistently provide unparalleled service in the most effective and efficient way possible.

Friendly, Local Service

Security systems installation from Security Instrument means peace of mind. Sometimes this simply means providing local experts to answer your questions or address your concerns. All of our staff — from account service to installation to monitoring to accounting — stand ready to provide the information you need, whenever you need it.