cuddlebug studio

I have the 15X15 clamshell 3802 heat press. set up directions state to "calibrate". Well, I didn't do this before the first use, but I had checked the temperature with a infra red heat gun thermometer and it was registering about 12 degrees hotter than the heat press display was showing. The second time, I calibrated it according to the instructions and when it was finished, I checked with the infrared and is was still registering 12 degrees hotter than the display. So, what is the purpose of "calibrating". Also, I notice that once it reaches the set temp - it cycles on and off every second to maintain the heat. Other appliances- irons, ovens, etc., don't cycle that frequently to maintain the temp. Is this just the way it is? Seems like it would but a real strain on the equipment and power source with that constant one second cycling. Thanks