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Pressure Calibration Equipment Manufacturer

We provide a wide choice of complete pressure calibration solutions serving a wide range of applications for use in the laboratory or remote locations helping save time and taking the guesswork out of critical pressure testing, maintenance and repair operations. Our product catalog includes intrinsically safe digital pressure calibrators, hand pumps, compressed gas controllers, hoses, adapters and full calibration kits all featuring their signature Quick-Test range of fast, fail-safe connections made in the USA using superior design and manufacturing techniques.

In 2016 we introduced the world's first laboratory grade digital pressure calibrator including digital pressure calibrator software.

Why Choose Ralston Instruments?

• 40 years of experience
• Made in the USA
• ISO 9001:2015 certified company
• Advanced manufacturing techniques
• User-oriented design features
• Quality calibration solutions and hand pumps
• Reliable service

For fail-safe precision calibration tools like adapters and hoses, Ralston Instruments is a one-stop destination. Contact our experts with your questions or to get a quote.

The Four Keys to Pressure Calibration

The Ralston Engineering Team has created industry-tested, rugged, portable equipment to address 4 key aspects of calibration systems.


Adapt to any reference, pressure source, process and device under test with quick, reliable, leak free connections without thread tape and sealant.


Rugged hand held and nitrogen based pressure sources for high, low and medium pressure and vacuum calibrations.


Volume control over nitrogen pressure sources makes calibration even more precise and efficient.


Specially configured pressure calibration systems complete with everything you need for your application.

Product Manuals

Download printable manuls and data sheets.