Lux Meters

Use the testo 440 air velocity and IAQ measuring instrument in combination with high-quality probes to measure and store all air velocity and IAQ parameters (please order probes separately). Up to 3 probes can be connected simultaneously: a Bluetooth probe, a wired probe and a temperature probe with type K thermocouple connector. Automatic probe detection and clearly structured measurement menus guarantee simple operation and will make your day-to-day work easier.

Use the lux probe with the compatible testo multifunction measuring instrument (please order separately) to determine illuminance. 

Lux probe – features

The lux probe is ideal for determining the illuminance in workplaces. It assesses the illuminance according to the V-lambda curve, which corresponds to the sensitivity of the human eye in daylight. White or warm light LEDs (K< 5,000) can also be measured without any problem.

The 1.4 m cable length means that you can place the probe directly at the measuring location and carry out the measurement from a sufficient distance. So the readings are not affected by your shadow.

The clearly structured measurement menu for long-term measurement enables the measuring instrument to be operated intuitively. Reading trends are reliably recorded thanks to the convenient input of measurement time and measuring cycle.

Intelligent calibration concept

You will get exceptionally accurate measurement results with the digital probe, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probe in for calibration – so the measuring instrument remains in continuous use.

Areas of application for the lux probe

Light conditions play an important role, particularly in the ergonomic assessment of workplaces. In order for light to also be good light, the illuminance must meet certain minimum values.
Use the lux probe to check the illuminance in offices and production areas, hospitals, museums or schools with reliability.

The testo 540 lux meter can be used to measure both artificial and natural light and provides you with a quick and easy means of measuring lighting conditions in the workplace.
The testo 540 lux meter: compact, easy-to-use, precise
The testo 540 lux meter is a pocket-sized entry level model designed specifically for carrying out spot checks in the workplace, shops and offices. The light sensor is modelled on the spectral sensitivity of the human eye and is ideal for measuring lighting conditions in a variety of different workplaces.

The compact, easy-to-use lux meter has a number of useful functions and features including a large, easy-to-read display, min/max values which can be shown at the touch of a button, a hold function that allows you to freeze the last reading and a protective cap for safe storage.