Contact VFC

Phone: 1-877-243-8832
Business hours:
Monday - Thursday: 9 am – 4:30 pm
Friday: 9 am – 4 pm
Fax: 1-877-329-9832

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Frequently Asked Questions

Data Logger Calibration Testing

What is Calibration Testing?

A calibrated device is one that has been professionally tested to determine its accuracy by comparing its readings to a reference thermometer that is traceable to national standards. Such testing confirms that the devices are accurately recording the temperatures in vaccine storage units.

An accredited laboratory issues a certificate of calibration testing (also called a report of calibration) as evidence of the standard of calibration testing performed by the laboratory.

Calibration Requirements

Every device monitoring vaccine storage unit temperatures for VFC-supplied vaccines must have a valid and current certificate of calibration. Providers will be asked to show the certificates during site visits conducted by VFC Field Representatives.

The VFC Program requires annual calibration testing for all primary and backup temperature monitoring devices, or every other year when the manufacturer recommends a period longer than two years. Devices that are not determined to be accurate to +1.0oF (+0.5oC) must be replaced.

Selecting a Testing Laboratory

Calibration should be conducted by an accredited laboratory. If a non-accredited laboratory is used, the laboratory must meet VFC requirements for alternative labs.

When you’re ready to get your device calibrated, place your backup device in the your vaccine storage unit while the primary device is being tested, or vice versa, so your vaccine temperatures are continuously monitored.


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