An  inconsistent cup of coffee  can make or break your day — but new research is shedding light on just how the industry can dial up the production process for a more reliable flavor . University of Oregon researchers repurposed a tool called a potentiostat, typically used to test batteries, to send an electrical current through coffee .  Through this simple process, they were able to identify coffee’s “chemical fingerprint” that determines the drink’s flavor . “It’s an objective way to make a statement about what people like in a cup of coffee,” university chemist Christopher Hendon, the lead researcher known around campus as “Dr. Coffee,” said in a news release. Traditional tests mainly focus on measuring the strength of coffee. Yet many other factors go into the  way coffee tastes , including roast color and extraction strength.…