Job Duties. As an instrumentation technician, you will test, calibrate, install, repair, and inspect monitoring devices. According to California's Employment Development Department, you'll also perform general maintenance on the equipment and design new measuring and recording equipment (www.edd.ca.gov).ccording to PayScale.com, the majority of instrumentation and controls technicians earned between $43,894 and $88,630 a year, as of January 2014.