In short, Calibration means the application or process performed for accurate measurement. In other words, we can also say that the measurement of the device that performs the measurement, the measuring instrument; can be simple tools such as a ruler or a liquid measuring cup with lines indicating volume on it, or it can be complicated equipment such as scales, thermometers, clocks, voltmeters, or even medical devices or devices used in space research. According to TDK, Calibration has passed from the French word "Calibration" to Turkish, "Measurement" means "Adjustment". TDK has said for the calibration test; "Application or process performed for accurate measurement." Calibration in English; 1. Checking a measuring instrument according to one or more standards so that it can perform correctly. 2. Applying a graduation to a measuring ruler.