About Our Company

Mass 4 Service, Inc. is a California S-Corporation established in 2005 to provide responsive, customer focused, aftermarket support for the leak detection equipment user community. Founded by a USAF veteran with 32 years of experience working for Varian Associates (now Agilent Technologies) on Helium Mass Spectrometer Leak Detection equipment, both in house and in the field, Peter Mahoney understands service. At Mass 4 Service, we provide the highest level of quality service to our many long-standing customers and welcome new customers to our service community.

Peter brings more than 30 years of leak detection experience with him each time he visits your facility.

We are based in San Jose, CA providing service to Western United States, Western Canada and Mexico. Customers may choose between services on-site in your facility or send your leak detector to our well-equipped shop in San Jose.

As one of the most experienced technicians on the North American continent, Peter brings more than 30 years of leak detection experience with him each time he visits your facility. He is an invaluable and trusted ally for all our customers, spanning a broad cross-section of industries: national laboratories, solar manufacturing, chip process, microwave, electronics, machine shops, scientific applications, aerospace, and more.

Each of our well-trained technicians is dedicated to exemplary customer service, along with prompt and professional machine service. We take pride in our reputation for conscientious and dependable customer service, with prompt response times, and competent problem solving.

Our service team is looking forward to servicing your leak detection needs. Let our team help your team get the most from their leak detection processes and equipment.


With over 30 years of experience repairing, maintaining and troubleshooting leak detectors and applications for helium and argon systems, our technicians will help you find solutions for today and tomorrow. All of our work is guaranteed. Phone support is provided to our customers as part of our service, along with speedy response times, quality replacement parts, and professional in-house service. 

Increase your application reliability, schedule Preventative Maintenance today!