Details about HAIR HYGROMETER for model engineer aircraft boat kit engine balsa book storageHAIR HYGROMETER for model engineer aircraft boat kit engine balsa book storage See original listing
17 May, 2012 21:30:32 BST
[ 16 bids ]
Lancashire, United Kingdom
Used: An item that has been previously used. See the seller’s listing for full details and description of ... Read moreabout the condition
1951 to Present
Human Hair Hygrometer
Aeromodeller Model Engineer Classic Car Storage
'In our Hygrometers, we only use human hair, which is sensitive to moisture to indicate the relative humidity.
This hair is specially treated to ensure its rapid reaction to differences in the relative humidity.
Even great differences in humidity are accurately registered within 30 seconds.
The special treatment also reduces the so-called hysteresis of the hair to half that of untreated hair.
Furthermore, the treatment also ensures a constant and even degree of measuring accuracy throughout the humidity scale.
Even in very low temperatures, such as -25 Degrees Celsius, our instrument reacts as quickly as others with ordinary hair in room temperatures.'
This is an interesting scientific instrument that measures the amount of humidity (‘dampness’) in the air. It is surprisingly quick and sensitive in its response to changes in humidity and will detect the moisture in my breath as I approach it within a few seconds. It has a number of uses, and if you can get the humidity down to around 30% in the room area that you are storing your valuable metal items (cars, motorcycles, model engines etc.) they will no longer corrode. It comes complete with its original box, which has some wear/damage and instruction booklet.
The instrument itself is in very good, clean condition and works perfectly. It can be easily calibrated by the user without any special equipment and information is given in the instruction booklet provided.
Rest of World Air Mail: £4.81
It will be very well packed with additional protective packaging.
All of my Items can be collected in Person.
Please see my other items of a similar interest.
Listing Copyright B. Worthington 2012