I am interested in purchasing the Home Environment Display Unit model 06043 for temperature monitoring at work. I am required to have documentation on all equipment regarding calibration. Either I need a certificate of calibration or have to hire someone to calibrate and certify the calibration. Does this equipment have this capability? Also if using a Hub to check temperatures remotely, does the Hub have to be calibrated or does it just transmit the readings? Does the hub have alarm limits also since it is supposed to notify you if the temperature is out of range?