Thermal Imager calibration

Do the thermal imagers like c3 or c5 Have to be calibrated.

I can only speak for the C5 but they come calibrated with a certificate that lists the calibration date.

thanks. just looking online and they charge an extra 315 to calibrate. just wondered if i needed to pay that as well.

Do you do qualitative analysis?
Or do you just look around for hot and cold spots?

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Qualitative VS quantitative analysis.
Quantitative analysis explores facts through measurements, numbers and percentages. Calibration would be required every 2 years.