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?


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