A checker or cashier rings up groceries and other goods at a retail store. In this career, your job duties include totaling the price of all goods for a customer, collecting payment for the items, and assisting the customer with the bagging of their purchases. In most positions, you must give a report of the day’s transactions to management. There are no firm educational qualifications needed for a career as a checker. Some employers prefer to hire checkers with previous cashier and cash handling experience. However, there are plenty of entry-level positions available. To be a good checker, you need excellent customer service skills a firm grasp of basic mathematics.