Simple Uncertainty Calculator

We are non-accredited ISO17025 (not a lab-but a manufacturer of uv lamps). We perform final inspection of our product in a test cabinets (internally built for volts and amps readings) and house built measuring gig to check the length of the product.

We calibrate the two pieces of equipment internally against externally calibrated measuring instruments (calibrators) - fluke meter for test cabinet and metal rule for measuring jig.
The calibrators are calibrated externally by accredited lab with measurement uncertainty specified.

We would like to develop our own total uncertainty calculations for our equipment. We have determined that minimum we would include the estimated uncertainty from equipment under test (EUT) - gathered from multiple readings and the uncertainty of the calibrator.

is there any smart calculator which could (based on those minimum two uncertainties) determine the total uncertainty for us?

So, we have a base for implementing a decision rule for pass/fail afterwards.

many suggestions for our situation would help.

Note, we are not accredited lab, nor required to make ISO17025 uncertainty calculations and certificates. We want to explore more on the subject of uncertainty calculations, as at the moment we don’t include uncertainty at all into our method of internal checks, I.e. Pass or fail is determined by engineer upon one measurement is taken and compared with the calibrator reading, checked with the min and max of the tolerance.

thank you

Agnes