11
4.4.5. Temperature unit
℃
/
℉
setting (P4)
(a) Short press
key in mode P3 to choose mode P4,press
key enters into
P4 see picture (4-5).
(b)Press
or
key to choose temperature unit:
℃
or
℉
,press
key
determines and returns;
(c) Press
key to enter into next parameter setting or press
key return to
measuring mode.
4.4.6.Purified water
，
Ammonia added purified water pH restitution(P5)
(a) Press
key in mode P4 to choose mode P5,press
key enters into P5 see
picture (4-6).
(b)Press
key and
key modified, " OFF "no compensation," H2O "Purified
water pH compensation;" nH3 "ammonia added purified water compensation;
(c)Press
key to enter into next parameter setting or press
key return to
measuring mode.
4.4.7. Back light display time setting (P6)
(a) Press
key in mode P5 to choose mode P6,press
key enters into P6
see picture (4-7).
(b) Press
and
key to choose the time of back light auto power off,press
