Wahl 2500MX, Instruction Manual

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2.1 Meter Operation
The Heat-Prober instrument has an accurate measuring range as stated on the front
label. When the temperature is below zero, a minus sign will automatically show on
digital display. Absence of a sign indicates positive temperature.
2.2 Peak Hold (MAXI-TEMP)
MAXI-TEMP peak hold is a standard feature on all models. With the switch in “P” or
peak hold position, it will sense positive increases in temperature and hold the highest
reading. This is convenient in making measurements where attention to the probe or
to the area being measured occupies the operator. The peak reading is held digitally by
the microprocessor and will not drift. To remove the peak reading, switch to “OFF”, or
to “N”.
2.3 Batteries (Figures 2-2)
The Heat-Prober is powered with five size AA rechargeable nickel-cadmium batteries,
1.25 volts each. The total capacity is 450 milliampere hours at 6.0 volts. The LED
display demands the largest power drain. Depending on the number of digits being
displayed, the batteries can power the instrument for a minimum of 5 hours or for as
long as 6 hours (with LCD display, the life is approximately 12 hours).
An alternate replaceable 9-volt alkaline transistor radio-type battery powers meters
with “V” designations in their part number. The instrument has a voltage regulation
which will accept and control the power from the 9-volt battery. These instruments do
not allow for recharging. Under special circumstances LED models 2500M, 1370M
and 1770M may be operated with disposable 9-volt alkaline batteries with an approxi-
mate 3 hour battery Iifespan. (Figure 2.2)
SPECIAL NOTE:
Rechargeable batteries should be kept at full charge. On the shelf,
they will gradually discharge, losing about 10% charge per week. If the battery fails to
respond to recharge, provisions have been made for ease of replacement. Open the
back cover and disconnect from the instrument by means of the Molex connector.
Replace with Wahl P/N 11681 (See Figure 2-2).