Pentax ETH-310 - Manual (Page 20)

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2.3.5 [R/L] key
Press the [R/L] key to change from clockwise to counterclockwise
rotation. A clockwise or counterclockwise reading is alternately
displayed each time the key is pressed.
Clockwise horizontal angle Count horizontal angle in a right
rotation direction (HR)
Counterclockwise horizontal angle Count horizontal angle in a left
rotation direction (HL)
If the power turns off during the counterclockwise mode, the display
returns to a clockwise horizontal angle display when power is turned on.
2.3.6 [Illumination key ]
Pressing the key, illuminates the LCD panel and telescope reticule.
The illumination is automatically turned off after five minutes.
Pressing the key, with illumination on, turns off the illumination.
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