What's the logic behind calibrating your tv every few months? Unfortunately, I don't have a calibrator to calibrate my TV when I want to, that is why my tv was calibrated only once. That was after buying it from one of the 'suking tindahan' here in PDVD. It would be a year since my tv was calibrated but I think PQ is still great 'til now or should I call them again to re-calibrate the tv?
The problem is that as the lamp of the display ages, the balance of the red, green and blue colors is also affected. I have seen displays which are perfectly calibrated but after a few months, the calibration is way off. After a year, you can be pretty sure that the calibration needs to be re-done.
If you are referring to the calibration done by the "suking tindahan" here, I am really not sure if they do a thorough gray-scale calibration. As an alternative, I would strongly suggest that you just get one of the calibration discs such as Video Essentials (or even a THX DVD such as Star Wars) and use the patterns there for basic calibration of brightness, contrast, color and tint. That will be a cheap solution. For a full calibration, you will need a sensor such as Spyder or Eye-One.