ECOTEST MKS-05 TERRA-P+ Operating Manual page 39

The value of the preset threshold level is fixed after all digits are programmed by
short pressing of the MODE button. To fix a new value of the threshold level, set all
digits on the LCD by pressing the MODE button, even if the values of the high-order
digits are not changed. Double extinction of the LCD will indicate that the
programmed level is fixed.
Press and hold the THRESHOLD button to check the value of the fixed DE
threshold level. The threshold level value will appear on the LCD in two seconds.
When the THRESHOLD button is pressed for more than four seconds, the low-order
digit starts blinking, indicating that a new threshold level value can be programmed.
A two-tone audio signal indicates that the programmed DE threshold level has been
exceeded.
Note. A zero value of the threshold level is set automatically when the dosimeter
is switched on indicating that the DE threshold alarm system is off.
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