This refrigerant scale's calibration is accurate compared to higher-end name-brand refrigerant scales. The calibration was accurate when I tested lower and higher-end refrigerant weights. The two critiques are it only displays the weight in decimals and doesn't display it in combination weights, ie. lbs, and oz. The second is that the display doesn't have a hook or a magnet to hold up the display when using it, compared to higher-end scales. For the price, this scale is a good value, it works perfectly and is very accurate.