Perfected to handle almost any size load you throw at it.
Off the shelf or custom engineered...yeah, we've got a switch for that.
We engineer custom sensors for the world's most critical missions. Let us engineer yours.
Intensely engineered, high-voltage reed switches. How many volts can we help you handle?

Custom Engineering

custom engineering

Your project is full of possibility. But to make it work, you need a custom-designed sensor at the leading edge of its capability. You need HSI Sensing.

Making Sense

making sense blog

Subscribe today for late-breaking insights and discoveries about sensing technology, from the guys who know it better than anyone.

Medical & Implantable


Because of their micro-miniature size, low consumption of power, and extreme reliability, HSI sensors are the premier choice for critical medical applications.

HSI Sensing

HSI Sensing is the innovative leader in the engineering, design, and precision manufacturing of custom reed switch and sensor technology. The industry experts at solving problems for customers in challenging design applications, we also precision manufacture those solutions for consistent, unmatched quality.

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News Center

HSI Introduces a Truly Universal Reed Switch

HSI Introduces a Truly Universal Reed Switch
This Form C switch has been perfected to handle both high and low power loads, while maintaining low and stable contact resistance. Read More

HSI Invests in Oklahoma Higher Education

HSI Invests in Oklahoma Higher Education
HSI supports USAO's Ready, Set, NOW program for science and technology. Read More