The ESI Model 253 Digital Impedance Meter is a semi-automatic instrument which permits rapid measurement of inductance (L) , capacitance (C) , resistance (R) , conductance (G) , and dissipation factor (D) at a test frequency of 1kHz. Measurement accuracy and versatility satisfies most demanding engineering or scientific applications . This instrument has both an autoranging mode and a manual range selection mode. The autoranging feature eliminates the need for manual range selecting, thus saving time and avoiding operator errors. It is designed to measure an unknown and select the lowest corresponding range automatically, thereby providing the highest resolution display. When a series of measurements are to be made within a particular range, time can be saved by turning the range switch to the corresponding fixed range position. Front panel LED lamps indicate the unit of measurement being displayed by the 3-1/2 digit LED readout. To operate, merely push the button for the desired function, manually turn the knob to the desired range, and connect the unknown. KELVIN KLIPS® test leads are included, thus ensuring true four-terminal connections. Excellent reliability of the Model 253 is assured through use of solid state devices and etched circuit board construction. Its small size is ideal for use on benchtops where work space may be at a premium. The carrying handle tilts the unit to a convenient viewing angle. Rear panel brackets provide line cord storage and enable it to be operated in a vertical position.