Accurate Technology DigiScale Models 18 & 28 User Manual Page 19 of 36better resolution, switch to 1/32 or 1/64 mode. For the best resolution andaccuracy switch to a decimal mode – inches or millimeters.When the measurement is greater than 99 63/64 inches, a +100+100+100+100 and/or+200+200+200+200 will illuminate in the upper right portion of the display to indicate thisamount must be added to the displayed reading. ie: If the measurement is154 5/8 inches, 54 5/8 and +100+100+100+100 will be illuminated on the display. If themeasurement is -307 23/64 inches, - 7 23/64, +100+100+100+100 and +200+200+200+200 will beilluminated on the display.+ AND - KEYSThe + (plus) and – (minus) keys are used to change the currently displayedposition to a different value.Momentarily depressing the + key increments the current position by one unitof measurement. Momentarily depressing the – key decrements the currentposition by one unit. Pressing and holding the + or – keys will cause thedisplayed position to change continuously. Holding down the key will causethe amount of change to speed up. This allows for quick adjustments over arange of large values.DATUM KEYThe DATUM key forces the readout to display a user programmed value.See Section 3: Programming, Programming Parameter Pr1.NOTE: While the DATUM key can be used to simply “zero” the currentlydisplayed value, it can also be programmed to force the readout to a presetvalue. This can be zero, or any other displayable value.Readout FunctionsREVERSE READINGSReverse readings means changing the direction of readings produced bymoving the encoder. If the readout decrements (reduces or goes negative)when it should be incrementing (increasing or going positive), the readout willneed to be re-programmed for your application.See Section 3: Programming, Programming Parameter Pr2.