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Testo 540 Pocket Lux Meter
The Testo 540 is a compact, entry-level pocket illuminance meter engineered for fast, accurate spot checks of ambient light levels in workplaces, commercial offices, and educational facilities. Featuring an optical sensor matched to the spectral sensitivity of the human eye ($V(\lambda)$), a measurement span from 0 to 99,999 lux (or foot-candles), and Hold/Min/Max calculation functions, it fits effortlessly into a shirt pocket for instant lighting assessments.
Features & Benefits
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CIE Human-Eye Spectral Matching ($V(\lambda)$): Optical sensor is filtered to match the spectral sensitivity of the human eye for objective, standard-compliant workplace light assessments.
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Wide 0 to 99,999 Lux Measuring Range: Evaluates everything from low-light storage rooms and corridors up to bright task lighting and shop windows.
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Selectable Units (Lux & Foot-Candles): Toggles easily between international Lux (lx) and imperial Foot-Candle (ftC) units at the press of a button.
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Hold & Min/Max Functionality: Freezes the current display value for easy documentation and records minimum and maximum lux levels during an inspection sweep.
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Backlit Display for Easy Readability: High-contrast illuminated screen ensures quick readouts in dimly lit production areas, basements, and stairwells.
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Pocket-Sized Ergonomics & Hard Protective Cap: Lightweight 95 g build includes a clip-on sensor shield, wrist lanyard, and belt pouch to survive daily tool-bag transport.
Description
Designed for facility managers, safety inspectors, and workplace ergonomists, the Testo 540 provides dependable non-contact light measurement without the bulk of traditional multi-piece photometers. Its high-grade silicon photodiode sensor is optically filtered to match the standardized spectral sensitivity curve of the human eye ($V(\lambda)$ curve per CIE), ensuring accurate luminous intensity evaluation whether measuring natural daylight, incandescent fixtures, or standard commercial workplace lighting.
Specifications
| Specification Attribute | Details / Values |
| Brand / Manufacturer | Testo (Testo SE & Co. KGaA) |
| Model / MPN | 540 (Part Number: 0560 0540) |
| Product Series | Testo Pocket Line Instruments |
| Product Category | Pocket-Sized Digital Lux / Illuminance Meter |
| Sensor Type | Silicon photodiode with spectral adaptation filter ($V(\lambda)$) |
| Measuring Range | 0 to 99,999 Lux / 0 to 9,999 Foot-Candles (ftC) |
| Measurement Accuracy | $\pm 3\text{ Lux}$ or $\pm 3\%$ of reading (compared to reference source) |
| Display Resolution | 1 Lux (0 to 19,999 Lux) / 10 Lux (20,000 to 99,999 Lux) |
| Measuring Rate | 0.5 seconds |
| Selectable Units | Lux (lx), Foot-Candles (ftC) |
| Measurement Functions | Hold, Min / Max values, Auto-off function |
| Display | 1-line LCD with integrated display illumination (backlight) |
| Protection Class | IP40 (with attached protective cap) |
| Power Source & Battery Life | 2× AAA micro batteries (1.5 V, LR03); Approx. 200 hours (without display backlight) |
| Operating Temperature | 0°C to +50°C (+32°F to +122°F) |
| Storage Temperature | -40°C to +70°C (-40°F to +158°F) |
| Dimensions & Weight | 133 × 46 × 25 mm (5.2 × 1.8 × 1.0 in, including protective cap); Approx. 95 g (with batteries and cap) |
| In The Box / Standard Accessories | Testo 540 Lux Meter, Snap-on Protective Sensor Cap, Belt Pouch, Wrist Lanyard, 2× AAA Batteries, Calibration Protocol, User Manual |
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