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4.  Luminometer 

L 

# Luminometer

measurement 

A handheld instrument that measures the light produced by an ATP reaction and reports the result in Relative Light Units (RLU).

## Definition

A luminometer is the detection device in an ATP hygiene monitoring system. After a surface is swabbed and the swab activated, the luminometer measures the light generated by the reaction between ATP and reagents inside the swab. The result appears within seconds as an RLU value.

## Why it matters

The luminometer turns an invisible biological signal into an actionable number, enabling hygiene teams to verify cleaning in real time rather than waiting for laboratory results.

## Practical applications

Used at production line changeovers, pre-service kitchen checks, post-cleaning verification in healthcare, and periodic audits in hospitality.

## Related terms

[ATP Swab](/knowledge-center/glossary/atp-swab)[ATP Testing](/knowledge-center/glossary/atp-testing)[Available Chlorine](/knowledge-center/glossary/available-chlorine)[Dilution Ratio](/knowledge-center/glossary/dilution-ratio)[Free Available Chlorine (FAC)](/knowledge-center/glossary/free-available-chlorine)[PPM (Parts Per Million)](/knowledge-center/glossary/ppm)

## Referenced in

-   [How Does ATP Testing Work?](/knowledge-center/articles/how-does-atp-testing-work)

## Need help applying this?

Our team can help design the right disinfection protocol for your operation.

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