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We hereby confirm and guarantee that if the refractometers were marked with "ATC" from us,  they must have ATC system. Please take it easy. We never sold any refractometers without ATC but marked it with ATC. If we marked it with ATC, it must have ATC, that is 1000% guarantee from us! 
How to identify the model with or without ATC:
The other hand or on a desk, if your hand feels Slight vibration from the refractometer,  this refractometer has ATC. If there was no any vibration, it is sure the refractometer doesn't haveATC!