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THERMAPROBE

® 

Waterproof 

Thermometer

Operating Instructions

Product code: 

810-421

INSTRUMENT OPERATION

 - The 

instrument is switched on by pressing 

the ON/OFF button located on the front 

of the instrument. Insert the probe into 

the substance being measured. The 

instrument reading may take a few 

seconds to stabilise, depending on the 

nature of the measurement

MAX/MIN

 - Press the MAX/MIN button to 

display the maximum reading (MAX symbol 

displayed). Press the MAX/MIN button again 

to display the minimum reading (MIN 

symbol displayed). Press MAX/MIN button 

again to return to normal readings.  

Please note: 

MAX/MIN readings are not 

saved so switching the thermometer off will 

clear the MAX/MIN readings.

°C/°F

 - Hold the MAX/MIN button for four 

seconds to switch between Centigrade 

and Fahrenheit.

DISPLAY ROTATION 

- The display will  

bi-directionally rotate automatically.

BATTERY REPLACEMENT

 - Replace 

the batteries when ‘BAT’ flashes in the 

display. The batteries are in the side of the 

instrument. Remove the battery cover 

with a coin turning anti clockwise and 

remove the cover containing the batteries. 

Replace with 

two LR44 

batteries. Insert 

into the battery 

cover before 

fitting and  

re-tightening 

the battery 

cover.  

ERROR MESSAGES

LLL.L

 - 1) Sensor open circuit  - the 

instrument has developed a fault 2) The 

reading is out of lower limit (-50 °C) - 

Keep the measurement above lower limit

HHH.H

 - 1) Sensor short circuit – the 

instrument has developed a fault  2) The 

reading is out of higher limit (300 °C) - 

Keep the measurement below higher limit

EMC/RFI

 - Instrument performance 

may be affected if operated within a 

high frequency radio field, such as near 

a mobile phone, or if subjected to an 

electrostatic shock. 

GUARANTEE

 - This instrument carries 

a one-year limited guarantee against 

manufacturing defects. Full details of 

liability are available at: etiltd.com/terms.

810-421/26.05.21

Supplied by

Electronic Temperature Instruments Ltd

Worthing · West Sussex · BN14 8HQ 

01903 202151 · [email protected] · etiltd.com

UK Regd.Des.No. 6049823, 6049824, 

6049825, 6049826 

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