Environmental Meter RH Temp Light (UV & LUX)

It is recognised that a major cause of damage to museum works of art can be in the light illuminating a room (Ultra violet and visible radiation), with the most damaging being the UV content.To enable curators and conservators to monitor these levels we offer a proven range of instruments.


With regard to light, this meter measures:

  1. Proportion of UV present (µW/Lumen)
  2. The total amount of UV (µW/M²)
  3. The amount of visible light present (Lux).

Allowing you to take action when needed: The amount of UV should be as small as possible, and in general should not exceed 20µW/M² or 75µW/Lumen. Normal museum light levels should be limited to 150-250 Lux. Once measurements have been observed action can be taken, light levels altered, if necessary UV filters fitted to display cases, windows and fluorescent tubes.

This single instrument measures:

  1. Humidity (RH)
  2. Temperature (Degrees C/F)
  3. Ultra Violet (UV)
  4. Visible Light (LUX)

The large 8m line display enables an easy to use menu system to select more advanced functions. Data Logging functions (available on 684-765C) enable over 10,000 readings of all four parameters to be automatically taken at selectable intervals (every 10 seconds to 1 hour). The saved data can be transferred to a computer by a USB connection.

Further technical information in 'Specification' tab below

Code Description Pack Size Price Stock QTY
P684-765 684-765 Environmental Meter for Temp., RH, UV, and Lux Each £574.00 (ex VAT) In Stock
P684-765C 684-765C Environmental Monitor with Data Logging Each £694.00 (ex VAT) In Stock
P684-7657 684-7657 RH Test Kit for 684-765 Environmental Monitor Each £120.00 (ex VAT) In Stock
Specification Recommended Alternatives

Visible wavelength: 400-700nM
Visible power: 0.1-200,000 Lux
UV wavelength: 300-400nM
UV power: 2-50,000 µW/M²
UV proportion: 0-10,000 uW/Lumen
RH Range: 0-100%
Display Resolution LUX: 0.1 up to 100 then 1. footcandles: 0.1 up to 100 then 1. UV: 0.1 up to 100 then 1. proportion of UV 1 uW/Lumen. Temperature: 0.1°C or °F. RH: 0.1%
Accuracy: Light & UV: 5% +/- 1 displayed digit. Temperature: +/- 0.5°C (+/- 0.9°F). RH: +/-2.5% 0-90% otherwise +/-5%
Data logging intervals: 10 sec (30 hours). 1 min (7.5 days). 10 mins (75 days). 1 hour (454 days)
Data logging capacity: 10,900 readings of all 4 parameters
Batteries: Rechargable NiMH
Dimensions: 150 x 65 x 25mm (including probes)
Weight: 165g

Software is provided to save the logged data in a CSV format that can be accessed and displayed by many applications (e.g. Microsoft Excel). Maximum and minimum values and their time measurement are displayed for each parameter. A calibration kit is available for user calibration of the RH sensor using saturated salt solutions.

Operation: The appropriate button is pushed depending on the measurement required and the reading taken. The environmental monitor automatically turns off 10 seconds after the last reading to preserve battery power. If a button is held down for over 5 seconds, the monitor enters continuous monitoring mode until another button is pressed.

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