The NF-Series standard models feature an adjustable RPM setting on the tool and a selectable Soft Start mode. Engineered for high volume manufacturing applications the brushless motor design ensures durability and reduces the standard maintenance costs associated with brush type electric screwdrivers. The NF power tool is ESD certified, ensuring less than 1 Ohm at the bit tip. ESD management assures product quality, cost savings and a reduction in overall ESD failures. Manufacturing engineers involved with microelectronic products are aware of the importance of controlling Electrostatic Discharge (ESD) failures. Lapses in preventing the occurrence of electrostatic discharge can affect production yields, manufacturing costs, product quality, product reliability, reputation and profitability. Requires STC40 transformer (power supply). Note: Requires Program Lock Key in order to adjust RPM & Soft Start Settings for select NF-Series models. Program Lock Key must be plugged into the STC