Operating Instructions for
Thermapen™ Pocket Thermometers
Instrument Operation
The instrument is switched on by unfolding the probe until the display illuminates.
Folding the probe back in will turn the unit off. If the probe is left open, the
Thermapen will shut itself off after several minutes to preserve the battery. Apply
the tip of the probe to the substance, medium or surface to be measured. The
instrument reading may take a few seconds to stabilize, depending on the nature of
the measurement. The probe measures the temperature very near the tip. It should be
immersed or penetrated at least 1/8 in. or more (Fast Thermapen).
Care and Cleaning
Don’t immerse any part of the plastic housing. It is NOT waterproof.
Do not bend the stainless steel probe shaft.
Do not leave the Thermapen in an oven. Instead, open the door, insert probe to the
center of the thickest part of item being measured (avoiding bone). Observe the
reading after display stabilizes, remove the Thermapen and close the oven door.
Clean the Thermapen with a slightly damp cloth and mild cleaner. Anti-bacterial
cleaners are best. Do not let liquid pool on the display window.
Open Circuit/Faulty Probe
If the probe has developed an “open circuit” fault the instrument will display “-1”.
Battery Replacement
Replace the battery immediately if the “Low Bat” illuminates, using a MN21 or a direct
12 volt equivalent. The battery is located under the sliding battery cover at the rear of
the instrument.
Battery Insertion
Open the battery cover at the end of the instrument by applying a little downward
pressure while pulling the cover horizontally away from the instrument. When it hits
the stop, tilt the cover and lift clear. To remove an old battery, pry the positive end
up first and withdraw the battery. Insert the new battery ‘negative end’ first and then
push down on the ‘positive end’ until it is firmly in place. Note the correct polarity on
the battery matches the instrument (marked on the rear label and inside the battery
compartment.) Finally, replace the cover.
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