Wahl 2500MX, Instruction Manual

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Probe is one example. A glass thermometer with 0.01 °C resolution is another. The
thermometer should be placed in close proximity to the TA-70 calibrator and Heat-
Prober under calibration to determine the correction temperature. Cover the three
units with a cloth cover to prevent drafts from affecting readings and allow to stabilize
for 30 minutes.
Always position the selector switch to the OFF position when not in use to prevent bat-
tery drain. A LOW battery indication is displayed by a rapidly changing display on the
thermocouple Heat-Prober under calibration. If in doubt as to battery condition, meas-
ure the battery voltage with a DVM. Battery voltage should be 6.75 volts +0.1 volt. Battery
life is at least one year for normal utilization.
Batteries may be replaced or measured by removing the four cover retaining screws
and carefully lifting off the cover. The battery may be removed from the holder and
replaced with a Wahl Instruments battery, part number 9782-9.
TA70 ACCURACY SPECIFICATIONS
Switch Pos Accuracy
130° F
650
1300
1900
0.2°F
1.0
2.0
3.0