• YOUR HOME SECURITY. YOUR WAY.

    Security Instrument brings elegant security & control to any home.

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  • ADVANCED HOME AUTOMATION.

    Cutting edge automation, control and custom schedules right in the palm of your hand.

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  • INTELLIGENT BUSINESS SECURITY.

    Data driven security systems that protect your enterprise from the inside out.

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  • WIRELESS ALARM MONITORING.

    From the living room to the board room, our local Central Monitoring Station has your back, 24/7.

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Serving DE, MD, NJ & PA

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

About Security Instrument

Commercial Case Studies

From Fortune 500 to local SMB’s throughout the Tri-State area, Security Instrument integrates custom security systems to meet the needs of our commercial clients.

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Customer Service

SI takes great pride in over 60 years of excellent service. When you need us, we are there, with 24 / 7 alarm monitoring and centralized local service for homes and businesses.

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What Our Clients Say

Service in over 47 counties in Delaware, Maryland, New Jersey & Pennsylvania!

“Our Team here at Bayshore has utilized Security Instrument for securing our warehouses, temperature and humidity controlled Fine Art Storage and many other storage services for over 25 years!  SI (as we call them) has proven to be a true partner and then some!  SI has continually invested in the needed technology and the PEOPLE – the TEAM at SI is responsive and on top of things – when you get the call at 2 am about a motion sensor going off and you’re 2/3 asleep it is nice to have a professional person on the other line with accurate data.”

One Instrument, Total Security.

With over 50 years of experience in the commercial security and life safety environment, we offer a wide selection of products from some of the most trusted manufacturers in the industry. Our clients can choose from a full complement of personalized support services to back-up their system and help safeguard their people and property.

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Customer Service Is Priority #1 With SI.

Security Instrument maintains a dedicated customer service team focused on delivering the most reliable, friendly, professional service and support available.

Combined with our state-of-the-art, local UL listed, Factory Mutual Approved central monitoring center, your can rest assured that we are always available when you need us.

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A Few Of Our Technology Partners

SI integrates hundreds of products from our strategic partners.
The list displayed here is a sample offering.

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Delaware Offices To Serve You

30 +

Vehicles On The Road Daily

24/7

Monitoring from Delaware’s only UL and FM listed central station.

Recent News & Blog Articles
All/Commercial Security/Home Automation/Home Security/News
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Valentines Weekend Security Tips For Your Business

For a business that caters to Valentine’s Day shoppers, diners or spectators, the most romantic weekend of the year may actually be the riskiest. If you own a restaurant, retail establishment or destination property, check out these tips on Valentine’s weekend security for your business.
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Making House Guests and Home Security Go Hand-in-Hand

Still hosting a few overnight visitors after the holidays are over? You want to create a friendly, welcoming environment for them to enjoy, but it doesn’t mean you have to compromise on home security while they're staying. The good news is, you can have the best of both; here’s how to make your house guests part of your home security routine.