Scientific Instruments was founded in 1967 by aeronautical engineer Jack Hoey and physicist Gilbert Halverson. Coming from aerospace and Academic backgrounds, they developed the first commercially available Germanium Resistance Thermometer (GRT) and supplied these devices for use on the Atlas rockets and the Apollo Lunar Program. Today, Scientific Instrument Inc is owned and operated by founder Jack's daughter, Leigh Ann Hoey.

An ISO 9001/2008 company, SI is involved in the design and manufacture of cryogenic temperature sensors for laboratory, industrial and medical applications. Temperature sensors include Silicon Diode, Ruthenium Oxide, and Platinum RTD sensors. These sensors are used in petrochemical, aerospace, laboratory and research, high energy physics devices and industrial applications. Other product areas include temperature indicators and controllers, petrochemical tank gauging systems for liquid natural gas (LNG) Storage tanks, LNG composition analyzer systems and aircraft temperature probes which are used on all Boeing and Airbus aircraft.

Scientific Instruments product line reaches a global marketplace. We are committed to providing the very best customer service through our experienced staff and other fully trained, global representatives. Management stands behind its Quality System which supports and ensures customer requirements are met and fully satisfied.

For over 45 years, Scientific Instruments, Inc. has been working with its customers across diverse industries to provide superior quality products and solutions for cryogenic temperature measurement and control. We also work with our industry partners, extending our capabilities to a wide range of measurement facilities. If we don't have something "off-the-shelf" to satisfy your requirements, we will work with you to develop the solution you need to realize the full potential of your application. If your application involves cryogenic temperature measurement, Scientific Instruments, Inc. is here for you.

Aerospace: Temperature probes for cryogenic liquid fuel support systems, liquid level probes, and signal conditioning devices
Aircraft: Aftermarket temperature probes for HVAC and other non-flight-critical systems
Industrial manufacturing: Two-stage temperature probe for LCD panel fabrication
Medical: High magnetic field temperature devices for MRI magnet systems
Research and Superconductivity: Full line of thermometers, temperature monitors, and controllers for your laboratory. All of our instruments are compatible with any of our thermometers and many other industry standard thermometers.
OEM: Scientific Instruments, Inc. works directly with cryopump and probe station manufacturers to supply high volumes of accurate and interchangeable thermometers and instruments for direct systems integration.
Oil & Gas: High-accuracy liquefied natural gas (LNG) and liquefied petroleum gas (LPG) level, temperature, and density (LTD) monitoring systems with rollover prediction and remote interfacing. Raman Gas Analyzer System (RGAS) for on-line, in-situ composition and calorific measurement of LNG.