Hach DR/2010 Instrument Manual page 45

Prompting messages will appear in the display at the appropriate times to
guide the operator through the procedure. When the instrument is turned
on, with the software version number appears.
SELF-TEST
The first prompt displays:
&&&& 
A list of the tests and their program numbers is located on the underside
of the sample compartment cover (light shield).
To enter the desired program number, use the
the wavelength setting is already correct, the prompt to adjust the
wavelength will not appear and the instrument goes to the zero prompt:
2 &&&& %
If a different program is desired, enter the program number with the
numeric keys or use the arrow keys to scroll to it. Holding an arrow key
down allows rapid scrolling. During scrolling, the program number is
displayed in the large digits (left side), and the parameter name is
displayed in the text area.
If the number selected is not valid, an error signal sounds (if beeper is on)
and the display momentarily reads:
 &&&&
The display returns to the prompt for the program number. Re-enter the
correct program number. The display will show (for example):
2 &&&& %
&&& #
- JAH2H H= 
NUMERIC
#&' &&&
AH 5=
#' &&&
2H H=  !
# &&&
.A626 )8
45
nm
keys. Press
ENTER
nm
A
nm
nm
. If