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Data Sheet | Instruction Manual
Product Description
The Testo 540 is a compact pocket-sized digital light meter engineered for rapid and precise illuminance measurement within commercial, administrative, and industrial work environments. Featuring an optical sensor carefully modeled after the spectral sensitivity of the human eye, this mobile hardware device performs quick lux evaluations of both artificial and natural lighting architectures.
Industry Applications
- Workplace Health and Safety Inspections: Fast compliance spot checks of operational illumination criteria in office layouts and corporate workspaces.
- Commercial Retail Audits: Measuring and managing light field optimization across retail displays, shelving setups, and storefront floors.
- Facility Management Verification: Field inspections of emergency egress illumination and general indoor environment baseline lighting parameters.
Key Features and Specifications
| Measuring Range | 0 to 99999 Lux / 0 to 9300 ftc |
| Accuracy | +-3 Lux or +-3 % (relative to reference instrument with 90 deg light irradiation angle) |
| Resolution | 1 Lux (0 to 19999 Lux) / 10 Lux (remaining range) |
| Measurement Rate | 0.5 seconds response interval |
| Enclosure Rating | IP40 protection class with rugged protective storage cap |
| Battery Run-time | Up to 200 hours of operations (average use, without display backlight) |
Package Contents
Testo 540 light meter module, snap-on protective transport cap, 2x AAA micro batteries, manufacturer calibration documentation.