With measurement devices your choice is either a colorimeter or spectrophotometer. Colorimeters contain three filters when they "look" at color and do a reasonable job at an affordable price. Spectrophotometers are more expensive but take many more sample measurements--up to 31--across the visible spectrum. The more color samples taken, the more accurate the measured results. When it comes to measuring color, either device is better than nothing. But if you have the budget, a spectrophotometer is the better choice.