Unscrew the battery compartment fasteners and lift off the cover.
Insert both cells observing the +/− polarity shown inside the compartment.
Refit the cover — do not use the device with the cover removed.
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Safety information
For reference. The complete, authoritative safety information — including disposal and regulatory details — is printed on the card supplied in the box. Read it in full before use.
To prevent fire or explosion
Do not expose the product to physical damage.
Use only manufacturer-approved batteries, correctly installed.
Do not expose batteries to excessive heat, sunlight, or fire.
Do not use the device with the battery cover removed.
To prevent injury to persons
Keep the device away from young children.
Do not ingest the batteries.
Do not use the device in a hot environment or near fire.
Correct use & maintenance
Operate only within −20°C to +40°C. Do not obstruct the rear atmospheric vent.
Tighten the hose connector by hand only; consult the manufacturer before changing it.
Keep away from pressurised water. Do not clean with alcohol or strong fluids.
Do not disassemble or service the device (beyond replacing batteries) unless instructed by the manufacturer or a notified body.