the Thermapen in boiling water but you must first know the correct temperature of boiling
water at your altitude and at the current atmospheric pressure. A calculator can be found at
www.thermoworks.com/bpcalc to quickly find that temperature for your zip code.
Instructions to use the Trim Adjust to tune your Thermapen calibration are downloadable from
the Thermapen Mk4 web page. You should not need to do this under normal use. A complete
factory re-calibration, including a certificate, is also available from ThermoWorks for a fee.
Intelligent Backlight
When the Thermapen is turned on, a light sensor (small round
window located just to the right of the main display) continuously
monitors ambient light levels. As it gets darker, the intelligent
backlight comes on automatically to read the digits in any light
condition. Covering the light sensor will also turn on the backlight
except in well-lit areas. The backlight will remain on for a minimum
of 10 seconds. If the unit is displaying the low battery symbol, the
backlight brightness will be reduced to prolong battery life.
Batteries
Each unit includes one pre-installed AAA (1.5V) battery located
inside the sealed battery compartment. An illuminated battery symbol (
) in the LCD
display indicates that the battery should be replaced
soon. The instrument will continue to measure
accurately, but it is recommended to replace the
batteries immediately (in low battery condition,
the backlight brightness will be reduced to prolong
battery life). Once the battery is too low to display
readings, the display will be replaced with ‘Flat’ then
‘Bat’ and then shut down. To continue using the
instrument, replace the battery.
Replacing the Battery
The battery is pre-installed on your new Thermapen
Mk4 and should last up to 3,000 hours. Should you
need to replace the battery, loosen the battery cover
screw using a Phillips screwdriver to remove the
battery cover. Pull up on the spring-loaded battery
clip and tip the unit to allow the battery to slide out.
Replace with a single AAA battery noting the polarity
(positive goes in first, retaining clip rests on negative).
Tighten the battery cover screw until the battery cover
is snug onto the seal. Do not overtighten.
Cleaning and Maintenance
To avoid potential bacteria growth and cross-contamination, wipe the probe after each use
and regularly clean the entire Thermapen body. Oils and grease should be wiped off the body
and the rotating hub. We recommend sanitizing wipes or a damp paper towel with an anti-
microbial cleaning solution. Protected from dust and immersion in water to 39” depth for up to
30 minutes. The probe should not be rotated while the body is submerged or under a stream
of water. Protect the plastic body from high temperatures. DO NOT LEAVE THE THERMAPEN
IN AN OVEN OR ON A HOT SURFACE. Not dishwasher safe.
Warning
IPA and other solvents may cause damage to the case and screen of this instrument.
Error Messages
•‘Lo’ is displayed if measurements are being made below the instrument range.
•‘Hi’ is displayed if measurements are being made above the instrument range.
•‘Err’ is displayed if the probe develops a fault. Call for details.
For all other error messages, contact ThermoWorks’ Technical Support at 1-800-393-6434
Loosen battery screw
Light Sensor
Battery Cover
AAA 1.5V Battery
Retaining clip rests on negative (–)
end of battery
