Comark N9002 - Manual (Page 10)

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6.3 Differential Mode (DIFF)
There are two DIFF modes available for the N9002, single
channel and twin channel. If only one channel (T1 or T2)
is enabled the instrument will memorise the temperature
at the moment the DIFF button is pressed and displays
this temperature on the lower left area of the LCD. It also
displays the difference between the current temperature and
the memorized temperature on the lower right area of the
LCD. The main display area shows the current temperature.
If both channels (T1 and T2) are enabled the instrument
will display the difference between T1 and T2 on the main
display and T1 and T2 actual temperatures on the lower left
and lower right areas respectively.
6.4 Clear MAX, Clear MIN
To clear MAX or MIN from the memory press CLEAR
followed by MAX or CLEAR followed by MIN.
N.B. The N9002 thermometer clears MAX and MIN
individually.
7.0 CONNECTING PROBES
The N9002 thermometer is a two-channel instrument using
sub-miniature connectors. When connecting probes to the
N9002 always remember to check the polarity of the plug before
fitting. In order to get correct results make sure that you have
selected the correct thermocouple type for the probe that you
have connected.
Note: It is recommended that insulated thermocouples be used.
8.0 CARE OF THE THERMOMETER
The N9002 thermometer is dust and waterproof as stated in
the specifications and will withstand harsh environments. Use
a damp cloth or warm soapy water to remove deposits and
prevent them from hardening or becoming sticky. Do not use
solvent-based cleaners or methylated spirit, etc.
Caution: Do not place the N9002 thermometer in a dishwasher.
If the instrument is to be stored for an extended period (for
example as a spare unit) remove the battery to eliminate the
risk of leakage.