Hach LANGE LT 200 User Manual page 21

Start up
Figure 3 Display and Keys of the LT 200 thermostat
1 Display
60
2 Touch-sensitive Keys
The instrument is operated using three
touch-sensitive keys located below the display
(Figure 3). The function of the key depends on
the display.
If no function is shown for a specific key, that
key is not currently active.
After the instrument has been initialized, the
display always shows the most recent setting of
the temperature programs.
.