Nikon D7200 body - Manual (Page 69)

69 Menu Guide
Select the increments used when making adjustments to ISO
sensitivity. If possible, the current ISO sensitivity setting is
maintained when the step value is changed. If the current
setting is not available at the new step value, ISO sensitivity will
be rounded to the nearest available setting.
Select the increments used when making adjustments to shutter
speed, aperture, exposure and flash compensation, and
bracketing.
b: Metering/Exposure
b1: ISO Sensitivity Step Value
G button
➜ A Custom Settings menu
b2: EV Steps for Exposure Cntrl
G button
➜ A Custom Settings menu