The Pioneer of Modern Leak Testing

Leak Masters

(Chinese Translation)

For more than 50 years, Uson has been the global leader in the field of leak standards for a wide range of leak and flow testing applications.   Our calibrated leak masters give you the ability to verify the performance of your leak tester or flow meter and are an essential accessory for your leak testing equipment and metrology department.


Certified performance

  • Traceable to NIST certified devices
  • Leak/Flow ranges: 0.2 cc to 20 scfm
  • Pressure: up to 1000 psi
  • Precision-made laser-drilled orifice, sealed in place between SAE O-rings

Top-quality calibration

  • Leak rates can be changed if necessary by replacing the laser drilled orifice plate
  • Choose from brass or stainless steel quick-connect fittings, in standard or small size
  • We offer alternate connectors to meet customer specific requests
  • Manufactured to customer specified leak/flow rate and pressure

Accessories and repair services

In addition to leak masters, Uson offers quick connectors, printers, cables and other accessories as well as full calibration and repair services.

Trusted resource

As a pioneer of automated leak testing equipment for medical devices, the automotive, pharmaceutical and medical packaging industries, and others, Uson is the experienced leader in these specialized fields.  Contact us to find out how we can help with your calibrated leak or flow instruments.

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Product Literature

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Contact Us


Uson L.P. - Corporate

8640 N. Eldridge Parkway
Houston, TX 77041 USA

Tel: +1-281-671-2000
Fax: +1-281-671-2001


Uson UK – Europe

Western Way
Bury St. Edmunds
Suffolk, IP33 3SP United Kingdom

Tel: +44-1284-760606
Fax: +44-1284-763049


Uson – China

Room 601, 567 Lan Gao Road
Shanghai, 200333, China

Main: 021-583 65859, 021-583 59187
Fax: 021-583 59185, 021-337 73559