. OPERATION COLD WEATHER OPERATION and is cold weather Brightness Contrast Ambient temperature Brightness Contrast -10 ° C (14 ° F) 7 (max) 5 - 4 -20 ° C (-4 ° F) 7 7 - 6 3 - 129 Monitor A feature liquid-cryst (particularly with the s tarting switch ON In this case, adjust the brightness and c ontrast of the screen. For details, see "Liqu id Crystal Monitor Adjustment S witch (PAGE 3-26)". difficult to read in If the screen is dark, in crease the brightness and contrast (extend the scale in the + E direction) to make the s creen brighter a nd easier to Guideline for bar displ ay for brightness and contrast i n cold weather