On-Site As part of our added services, Sintrax Instruments offers on-site calibration services to further help our customers reduce their down time and eliminate shipping costs. We will work with you to schedule the most convenient time for your business for our trained technicians to come to your facility and perform all the required services that your business requires. With our flexible scheduling program, our technicians are available to you 24 hours a day as an added value to your business.