ISO/IEC 17025 Accredited Pressure Calibration
Accurate pressure measurement is essential to safe, efficient, and reliable operations. Our national network of local calibration experts delivers the precision you require, from supporting process control to protecting equipment and reducing costly operational risks.
Our Pressure Calibration Services
Pressure instruments support critical applications across chemical processing, power generation, HVAC, hydraulics, manufacturing, medical devices, and more.
When they drift out of specification, the results can be serious—process instability, safety hazards, equipment failures, and production downtime. The Accredited Labs network provides comprehensive pressure calibration services that keep your instruments performing within their required accuracy ranges.
Our Process
Pressure calibration involves verifying and adjusting instruments that measure gauge, absolute, differential, and vacuum pressure across defined operating ranges. Each device is compared to certified reference pressure standards with known, traceable values to identify any deviations from its intended performance.
Experienced technicians test instruments using precisely controlled pressure sources throughout the full measurement range, document all variations, and may make the adjustments required to restore accuracy. If an instrument cannot be restored to the required accuracy range, you receive detailed reporting with the data needed for corrective action, maintenance planning, or replacement decisions.
All pressure calibrations follow internationally recognized standards that support consistency, reliability, and complete measurement traceability. Each instrument is returned with documentation linking its accuracy to national pressure measurement standards—meeting the needs of quality management systems, safety regulations, and process control requirements.
Types of Pressure Measuring Instruments We Calibrate
Our comprehensive pressure calibration services cover the complete spectrum of pressure measuring technologies used across industries:
- Digital Pressure Gauges: Electronic instruments that provide precise digital pressure readings with data logging and communication capabilities. These instruments require calibration of pressure sensors, signal processing electronics, and display systems to ensure accurate measurements across their full range.
- Analog Pressure Gauges: Traditional mechanical gauges including Bourdon tube, diaphragm, and bellows-type instruments. Calibration ensures accurate pointer indication, scale linearity, and mechanical stability across the measurement range and various environmental conditions.
- Pressure Transmitters: Industrial instruments that convert pressure measurements into standardized electrical signals for process control systems. Calibration verifies both pressure measurement accuracy and signal output characteristics across the full measurement and output ranges.
- Differential Pressure Instruments: Specialized instruments that measure pressure differences between two points, commonly used for flow measurement, filter monitoring, and level detection. These instruments require calibration of both pressure inputs and differential measurement accuracy.
- Absolute Pressure Gauges: Instruments that measure pressure relative to perfect vacuum, used in vacuum applications, barometric measurements, and applications requiring absolute pressure references. Calibration ensures accurate absolute pressure measurement across atmospheric and sub-atmospheric conditions.
- Vacuum Gauges: Specialized instruments for measuring sub-atmospheric pressures in vacuum systems, processing equipment, and scientific applications. These instruments require specialized calibration procedures and vacuum reference standards.
- Pressure Switches: Devices that provide electrical switching based on pressure setpoints, used for safety systems, process control, and equipment protection. Calibration verifies switching accuracy, repeatability, and deadband characteristics.
- Pressure Transducers: Sensors that convert pressure measurements into electrical signals for data acquisition and control systems. Calibration ensures accurate pressure-to-signal conversion and long-term stability.
- Manometers: Liquid column instruments used for precise pressure measurements and as working standards. These instruments require calibration of scale accuracy, liquid properties, and environmental corrections.
- Pressure Calibrators: Instruments used to calibrate other pressure devices require regular calibration themselves to maintain their accuracy and traceability as reference standards.
Find Pressure Calibration Services
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Accutek Lab
Accutek Lab has been providing reliable and cost-effective pipette calibration services across the United States since 1996.
Calibration ServicesPipette Calibration -
Aldinger
Since 1972, Aldinger has been providing top-quality calibration services for test and measurement equipment in Texas and beyond.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Mass Calibration +7 more -
Cal-Cert
Cal-Cert is committed to providing the highest level of calibrations and certification service to our customers.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Pressure Calibration Temperature Calibration +3 more -
Cal-Labs
Cal-Labs has provided quality calibration in Southern California since 1977. We are A2LA accredited to ISO 17025.
Calibration ServicesDimensional Calibration -
Calibration Services Inc.
Calibration Services, Inc. (CSI) is an on-site and in-house calibration firm specializing in calibration and service of mechanical testing devices.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
Cal Tec Process Management
The calibration specialists at CTPM have been providing precision calibration and quality assurance since 1987.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +2 more -
Calser Calibrations
Since 1979, Calser Calibrations has delivered trusted, precision calibration services backed by a commitment to quality and reliability.
Calibration ServicesConstruction Materials Testing Equipment Calibration Dimensional Calibration Force Calibration Mass Calibration Pressure Calibration +3 more -
CMG Sales, Inc.
CMG Sales, Inc. is a leading manufacturer sales representative and ISO 17025 accredited calibration laboratory providing services to manufacturers nationwide.
Calibration ServicesCoating Thickness Calibration Color Calibration -
Color Calibration Group
Color Calibration Group has been providing professional calibration services for all your color, light, and viscosity calibration needs for over 25 years.
Calibration ServicesCoating Thickness Calibration Color Calibration -
ETI Precision
ETI has been a leader in the calibration, repair, and sale of test and measurement equipment since 1994, and covers all 50 states.
Calibration ServicesElectrical Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +2 more -
Holts Precision, Inc.
For over 60 years Holts Precision, Inc. has performed calibrations & repairs on all major brands of gaging equipment.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Mass Calibration Pressure Calibration +1 more -
Huston-DePue
Established in 1960, HDCL is staffed by experienced professionals who understand the critical role accurate measurement plays in quality control and regulatory compliance.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +3 more -
Instrument Technologies, Inc.
For over three decades, Instrument Technologies, Inc. (ITI) has been a trusted partner for regulated industries seeking precision, compliance, and operational reliability.
Calibration ServicesFlow Calibration Mass Calibration Dimensional Calibration Pressure Calibration Time Calibration +1 more -
IPM, Inc.
Industrial Process Measurement, Inc. has been in the instrument supply, service and calibration business for over 30 years.
Calibration ServicesDimensional Calibration Electrical Calibration Flow Calibration Force Calibration Humidity Calibration +6 more -
J & J Calibration Service
J&J Calibration Service, an ISO-17025 accredited company, offers unmatched mobile calibration capabilities and laboratory calibration services.
Calibration ServicesDimensional Calibration Electrical Calibration Force Calibration Pressure Calibration Temperature Calibration +1 more -
OCS Technologies
Founded in 1930, OCS Technologies is a trusted multi-discipline calibration service provider as well as leading product distributor.
Calibration ServicesForce Calibration Torque Calibration Mass Calibration Dimensional Calibration Pressure Calibration +3 more -
OnCal
With over 23 years of experience in pipette calibration in the Pacific Northwest, the OnCal Corporation guarantees seamless and dependable metrology services.
Calibration ServicesPipette Calibration -
Polymer Testing Instruments
Since 1996 Polymer Testing Instruments Inc. has provided high quality service and calibration of equipment for the rubber, plastics, and energy industries.
Calibration ServicesForce Calibration Torque Calibration Dimensional Calibration Pressure Calibration Temperature Calibration +1 more -
Precision Calibration Systems
PCS is a full-service ISO 17025 Accredited calibration laboratory, founded with the goal of providing reliable and accurate instrument calibration service.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Quality Control Services
Quality Control Services is an established, accredited calibration services and laboratory equipment company with over 40 years of experience.
Calibration ServicesForce Calibration Mass Calibration Pipette Calibration Temperature Calibration -
Quality Surveillance, Inc.
QSI has been providing Los Angeles, Ventura, Santa Barbara and Santa Clarita Counties with reliable and cost effective metrology services since 1992.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +2 more -
Scale Service & Supply
From laboratory balances to truck scales, Scale Service & Supply has been providing precision calibration for weighing systems since 1987.
Calibration ServicesScale Calibration Mass Calibration -
Servo Innovations
Servo Innovations, founded in 2005, has earned industry-wide trust for its accredited calibration, repair, and technical services.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Dimensional Calibration Pressure Calibration +1 more -
Tescom Calibration Services
Tescom Calibration Services has provided sales, repair, and calibration of telecom test equipment since 1982.
Calibration ServicesFlow Calibration Force Calibration Torque Calibration Mass Calibration Dimensional Calibration +4 more -
Trident Calibration Labs
Serving the greater Phoenix area, Trident Calibration Labs has more than 100 years of combined calibration experience.
Calibration ServicesElectrical Calibration RF & Microwave Calibration Dimensional Calibration Force Calibration Mass Calibration +6 more -
Tru Cal International
Serving as an asset to countless businesses in a variety of industries, Tru Cal International has specialized in test equipment calibration since 1992.
Calibration ServicesElectrical Calibration Dimensional Calibration Force Calibration Pressure Calibration RF & Microwave Calibration +3 more -
Utah Scale Center
Utah Scale Center offers servicing and calibrating of industrial scales across the Rocky Mountain Region, with 70+ years of experience.
Calibration ServicesScale Calibration -
Washington Calibration
Washington Calibration has been providing customers with quality gage repair services for all their inspection measuring instruments for more than 34 years.
Calibration ServicesDimensional Calibration Force Calibration Mass Calibration Pressure Calibration Temperature Calibration +1 more
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Audit-Ready Calibration in 3 Simple Steps
Submit Your Equipment List
Send us a list of the equipment you need calibrated, and we’ll provide a tailored quote with clear pricing—no hidden fees.
Schedule Your Calibration
Choose a convenient time for a mobile or on-site equipment calibration. Our certified technicians ensure precision and compliance with ISO/IEC 17025 standards.
Stay Compliant & Audit-Ready
Receive detailed calibration reports and certification, giving you peace of mind for audits and operational excellence.
Frequently Asked Questions
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What types of pressure instruments are typically included in a pressure calibration program?
Pressure calibration programs typically include pressure gauges, digital pressure indicators, pressure transducers and transmitters, manometers, pressure switches, barometers, and vacuum gauges. Instruments used in process control, safety systems, quality testing, and regulatory compliance monitoring should all be included in a formal calibration schedule.
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What is the difference between gauge pressure, absolute pressure, and differential pressure calibration?
These refer to different reference points for pressure measurement. Gauge pressure is measured relative to ambient atmospheric pressure. Absolute pressure is measured relative to a perfect vacuum. Differential pressure measures the difference between two pressure points in a system. Calibration must address the correct reference type for each instrument — using the wrong reference leads to systematic measurement errors that may not be immediately apparent.
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How does pressure calibration support safety and regulatory compliance in industrial environments?
Pressure instruments are often directly linked to safety systems — including relief valve setpoints, overpressure shutdowns, and process interlocks. If these instruments drift out of calibration, safety systems may activate too early, too late, or not at all. Regulatory frameworks in industries such as oil and gas, pharmaceuticals, and food processing require that safety-critical pressure instruments be calibrated on defined schedules with traceable documentation.
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Can pressure calibration be performed in hazardous or classified locations?
Yes, with appropriate precautions. Many calibration providers offer on-site pressure calibration services for instruments located in classified hazardous areas, using intrinsically safe equipment or working under permit-to-work procedures as required by site safety protocols. It is important to communicate the location classification and any site safety requirements to your calibration provider before scheduling service.
