calibrate

(verb) make fine adjustments or divide into marked intervals for optimal measuring. Synonyms: graduate, fine-tune. Examples: "Calibrate an instrument." "Graduate a cylinder."

(verb) mark (the scale of a measuring instrument) so that it can be read in the desired units. Example: "He calibrated the thermometer for the celsius scale."

(verb) measure the caliber of. Example: "Calibrate a gun."