Range checks assign upper and lower limits to acceptable data values. This technique can be used to control orders placed with vendors. For example, a range of 500 to 1,000 units can be set as the normal order quantity for a particular class of product. A range check is also useful for controlling payroll transactions. If the range of pay rates for hourly employees in a firm is between $8 and $20, all payroll records can be checked to see that this range is not exceeded. The purpose of this control is to detect keystroke errors that shift the decimal point one or more places. It would not detect an error where a correct pay rate of, say, $9 is incorrectly entered as $15.