Test Equipment requires periodic calibration to ensure it is working correctly.
Unfortunately this can be very expensive and the cost may be impossible to
justify for the casual user.
I do not maintain formal traceability on my
Calibration Lab. but do regularly cross check it for consistency. If you
have a concern about a particular item of equipment, I can check the
I have the following Calibration
Systron-Donner M107 DC source
Bradley Electronics 232 AC source
Bradley Electronics 125B AC source
Bradley Electronics 192 Scope calibrator
Tektronix TM500 calibration system
Time Electronics 1030 portable DC source
Precision Resistance and Capacitance boxes