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Acoustic light probe and contrast detector

Product code: DH402
£41.94 (inc VAT) £34.95 (ex VAT)

The ex VAT price will apply to blind or partially sighted people, or someone buying on their behalf.

Last chance to buy! 
Simple light detector to indicate the light intensity and contrast in a room. Using audible signals it indicates whether it is bright, dark, artificial or natural light. Also includes a re-usable tip to check whether lamps are turned on or off.


This light probe and contrast detector is designed for blind and partially sighted people. The artificial eye senses light intensity and contrast and announces the results using several audible signals to show if it is a bright or dark, a natural or an artificial source of light. The light probe includes a special tip that can be attached to the top of the device. With the help of this tip you can control small diodes to see if the lamp of any electronic device in your household is switched on or not.

This product includes two AAA batteries. Replacement AAA batteries are available from RNIB (product code 1 x BAT03).


  • Light probe detects light intensity and contrast
  • Emitts audibe signals to indicate results
  • Tip included to check individual lamps
  • Includes two AAA batteries
  • Size: H15 x L165 x W27mm (0.59" x 6.5" x 1.07")
  • Weight: 52g (1.8oz)
  • 12 month warranty

We will make every effort to deliver within 5 working days, however if  you have not received your goods within 10 working days please contact our Helpline on 0303 123 9999 who will be able to help you. Please note that for special orders the delivery can take up to six weeks and this is stated in the product details, where relevant.

Most of our products and some publications in large print (16 point and above) can be sent by freepost under the 'Articles for the Blind' scheme.

However, the Articles for the Blind scheme offers no guarantees of delivery or insurance for valuable items. We do, therefore, have to make delivery charges for some high value products which need to be sent by a special delivery method. Where a product incurs a delivery charge this is highlighted in the product details and will be added to your order at checkout.

When we send your products, the package will include a 'dispatch note' with details of the contents. It is really important to check this against the actual contents of the package and alert us immediately (within 7 working days) of receiving the order about any discrepancies. 


If you find this product is unsuitable for your needs, or is faulty, then follow our returns instructions to ensure we deal with your enquiry efficiently.  Some products cannot be returned.  More information can be found in product description where applicable. 

Special order products are non-returnable unless faulty. We kindly ask our customers to ensure that any faulty products being returned are packaged securely for stable transit, or the warranty may be voided. Where possible, please use the original packaging. These include specially ordered items that are not part of our standard range. This also includes personalised items, including computer packages, as well as special order canes, walking sticks and more.