Ametek JOFRA DTI050 A Reference Manual page 16

Setting resolution
Use the arrow keys to adjust the resolution used for temperature
readings. When you press the up arrow, the number of zeros to the
right of the decimal point will increase to a maximum of three.
SET RESOLUTION
Fig. 6
Setting display contrast
Use the arrow keys to set the display to the desired contrast.
SET CONTRAST
Fig. 7
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