Can the sensors be calibrated in the field?

Yes. Every sensor carries a three point calibration table that the user can reach through the on-device menu. Recalibration can be done by a metrology lab or on site by comparing against a certified reference instrument.

PDL offers one-point (CB1) and three-point (CB-2) NIST-traceable calibration with certificates, plus a swap-out program so you are never without a sensor while one is out for calibration.