The Fluke Model 893A and AR AC-DC Differential Voltmeters provide conventional or differential measurements of ac voltages from one millivolt to 1100 volts ac and dc voltages from 10 microvolts to 1100 volts dc. Conventional (TVM) measurements are made with an accuracy of ±3% of the selected range to initially determine the magnitude of the measured voltage. The differential (NULL) mode is then used with an improved accuracy of up to 250% over that of the conventional mode to determine the exact value of the measured voltage. One linear meter-scale greatly simplifies all measurements made with the instrument. Whenever the instrument is operated on the differential mode, an inline digital readout representing the magnitude of the measured voltage is available from the front panel Read-out dials. Two versions of the instrument are available and are identified as the Model 893A or Model 893AR. The Model 893A is a portable unit, half-rack in width, with a tilt-down carrying handle. This handle detents into the instrument’s feet to serve as a tilt-bale during bench-top use of the instrument. The Model 893AR is also a portable unit, but is of proper width for installation in a standard electronic equipment rack. Carrying of this instrument is provided by two front panel handles. A tilt-down bale located on the bottom of the instrument facilitates bench-top use of the instrument, A rechargeable battery and recorder output options are also available for either version of the instrument. These options can be installed at the factory, upon request, or in the field. Option Kit 893A-7Ü01 comprises the rechargeable battery pack and, when installed in the instrument, is identified as the -01 option on the rear panel decal. Option Kit 893A-7002 comprises the recorder output and, when installed in the instrument, is identified as the -02 option on the rear panel decal.