InstroTek, Inc.

My Account

San Francisco, CA


Our goal is to better serve our customers throughout the Midwest region.  InstroTek has built a solid, long standing relationship with our customers based on top-notch customer service, attention to detail and an excellent service department.

Our People


Chris Johnson is the service manager at our Concord, CA location, and has been with InstroTek for a decade servicing and calibrating nuclear gauges. Before moving to our Concord, CA location Chris successfully ran and managed our Las Vegas, NV office for seven years. He spent four years in the U.S. Marines before moving from his hometown of Fort Morgan, CO to Las Vegas, NV where he started in his first position with the company. Chris graduated from ITT Technical with an AAS in Computer and Electronics Engineering Technology.


Our Service


Full 3 and 5 Block Calibration
Using NIST traceable calibration blocks and meeting ASTM D6938, D2950, D7013 and AASHTO T310 requirements for Nuclear Gauge Calibration and Verification.

Cleaning and Lubrication
Cleaning and lubricating all mechanical components for optimal performance under any condition.

Extended Electronic Inspection
Inspection of all electronic components using the most up to date electronic testing equipment.

Full Mechanical Inspection
Mechanical components are inspected to ensure proper operations on the field.

Detector Signal Adjustment
The detector signals are adjusted for any change that has occurred over time.

Top Bumper and Scraper Ring Included
Due to normal wear, the scraper ring and top cap bumper will require replacement for proper performance. These parts are always included with a full calibration and service at no extra cost.



    Our Promise


    No Hidden Costs!
    At InstroTek, you will be charged only for basic service and calibration. If your gauge requires any repairs, you will be contacted first and with your consent the repairs will be done using the highest quality parts at the lowest cost to you.

    Superior Technical Service!
    At InstroTek, only the most qualified factory trained technicians will be servicing and calibrating your nuclear gauges.

    A Friendly Representative Every Time You Call!
    You don’t have to talk to an answering service or recorded message! InstroTek, will always have a qualified and friendly voice on the telephone to answer your questions.

    Fast Turnaround
    InstroTek has always been the leader in fast turnaround times. We know that the sooner you receive your gauge back from us, the sooner you can utilize your gauge out in the field.


    5052 Commercial Circle, Concord, CA 94520

    (925) 363-9770