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4.3

For all other errors, a generic error message “Er” is displayed. In the event of this 
occurring, it will be necessary to reset the unit. To reset the unit, turn the 
instrument off, remove the battery and wait at least one minute. Now reinsert the 
battery and turn the unit on. Should the error message remain, contact your 
authorised Sealey dealer for assistance. 

5.

BATTERIES  

5.1

The VS904 incorporates a visual guide to the battery status:

“Battery OK” 

Measurements are possible.

“Battery Low” 

Battery needs replacing.

Measurements are possible.

“Battery Exhausted”

Measurements are not possible.

Replace battery.

5.2

When the “Battery Low” symbol appears, the batteries should be replaced immediately with two batteries which are
located under the cover on the front of the handle grip.  

NOTE: 

It is important that the unit is 

off 

before the batteries are replaced. A malfunction could occur if this precaution 

is not taken. Be sure to dispose of the batteries safely and in accordance with local laws regarding potentially hazardous 
waste. 

4.

LCD ERROR MESSAGES

4.1

“Hi” or “Lo” will be displayed when the temperature being measured is outside the 
range of the instrument. (See Specification, section 2.)

4.2

“Er2” is displayed when the unit is exposed to rapid changes in ambient 
temperature.
“Er3” is displayed when the ambient temperature of the unit is below 0ºC (32°F) 
or exceeds 50ºC (122°F). In both cases allow a minimum of 30mins for the unit to 
stabilise and adapt to the working temperature. 

6.

STORAGE AND CLEANING

6.1

The sensor lens should be kept clean at all times. Care should be taken when cleaning the lens  - it is an extremely 
delicate piece of equipment. Use a cotton swab moistened with a little water or medical alcohol, allowing the lens to dry 
fully before attempting to use the unit.

DO NOT 

submerge any part of the VS904.  

6.2

The VS904 should be stored between -20ºC and +65ºC.  

NOTE:

It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component

parts without prior notice.

IMPORTANT: 

No liability is accepted for incorrect use of this product. 

WARRANTY: 

Guarantee is 12 months

from purchase date, proof of which will be required for any claim. 

INFORMATION: 

Call 01284 757525 for our catalogue & promotions. Leave

your full name, address & postcode.

01284 757500

01284 703534

[email protected]

Sole UK Distributor

Sealey Group,

Bury St. Edmunds, Suffolk.

www.sealey.co.uk

Web

email

3.

OPERATION

3.1

To measure the surface temperature of an object/region, simply point the device at the object/region in question and press the 
trigger.

NOTE! When the trigger is released the reading will be held for 15 seconds (HOLD will be displayed) and then the thermometer will
automatically shut down unless the trigger is pressed again.

3.2

ºC/ºF MODE.

3.2.1

To change the display from ºC to ºF (or visa versa), firstly turn the unit on by pressing the trigger. Now press the mode 
button and the ºC or ºF symbol will be displayed, press again to cycle display between ºC or ºF.

Declaration of Conformity 

We, the sole importer into the UK, declare that the product listed here

is in conformity with the following standards and directives.

The construction file for this product is held by the Manufacturer and may be inspected, by a national
authority, upon request, to Jack Sealey Ltd.

For Jack Sealey Ltd. Sole importer into the UK of Sealey Professional Tools.

26th June 2007

INFRARED LASER DIGITAL

THERMOMETER 8:1

Model: 

VS904

EN 60825-1 Laser safety

93/68/EEC CE Marking Directive

2002/96/EC WEEE Directive

89/336/EEC EMC Directive

Signed by Tim Thompson

2.2

Distance & spot size 

As  the distance (D) from the object increases, the diameter (S) of the area measured by the unit becomes larger. 

D

S

Displays highest reading for each session.

Current temperature reading.

°C or °F display.

Trigger released, laser reading held for fifteen seconds
or until trigger pressed again.

Battery state.

Environmental Protection.

Recycle unwanted materials instead of disposing of them as waste. All tools, accessories and packaging should be sorted, 
taken to a recycle centre and disposed of in a manner which is compatible with the environment.

When the product is no longer required, it must be disposed of in an environmentally protective way. Be sure to dispose of 
the batteries safely and in accordance with local laws regarding potentially hazardous waste. 

2.3

Emissivity

2.3.1

Emissivity is a term used for the ability of a surface to radiate energy. Most (90% of typical applications) organic materials and 
painted or oxidised surfaces have an emissivity of 0.95 (pre-set in the thermometer). 

2.3.2

Inaccurate readings will result from measuring shiny or polished surfaces. To compensate, cover the surface to be measured 
with masking tape or flat black paint. 

2.3.3

Allow time for the tape to reach the same temperature as the material underneath it. Measure the temperature of the tape or 
painted surface.

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