Sound level Meter Calibration

[DAVETEE]

I have never calibrated a sound level meter or pretended to know anything about them, so pardon my ignorance.   My questions are as follows.
Can a Quest Technologies QC-10 Calibrator be used to calibrate, GenRad 1565-B sound level meter?
I have read 33K3-4-2895-1 and it seems to be a very far stretch to even think it can be done.
I have been instructed to do this and it does not seem acceptable. 

I have also been instructed to state that the calibration is a "one to one calibration".
Is this a standard term?
I have over 14 years in calibration and I don't think this is a standard term. 
I am uncomfortable with this situation but I would like as much information as possible as to support my position.   So, I appreciate any and all information.

I thank everone for their time.

[USMCPMEL]

Well the first thing you need to do is look up the accuracies on both instruments. The customer generally needs to approve the calibration if the TUR is less than 4 to 1 but yes I have calibrated instruments for customers that the stated TUR was a 1 to 1 ratio.

[ck454ss]

Be Carefull,

If all you are looking at is the accuracies of the equipment then you need to state the TAR (Test Accuracy Ratio) is 1 to 1 and is not compliant with ANZI-Z540 or 17025. 

If you have calculated your uncertainties of your measurement than you can determine if your TUR(Test Uncertainty Ratio) is 1 to 1 or maybe greater and is compliant with the above specifications.