Linen Testers
Select from a variety of different sizes and shapes and qualities
The linen testers offered by SPI Supplies are all collapsible, and are
designed for professional use. They can easily be carried in ones shirt
pocket (except possibly for the largest one). Our linen tester products
are among our most frequently asked for products because of their many
applications. They are available only with high quality glass lens, in
black anodized aluminum frames and now also, in light weight black plastic
frames for outdoor use.
Traditionally, linen testers got their now generally used name, because of
their original application, that is, the "counting" of the number of threads
in a fabric. It is not at all unusual for us to be in some foreign
country's bazaar, as we were not too long ago in Istanbul, and find that the
famous carpet sellers were using the same linen testers to validate the
number of "knots" in expensive silk carpets. These professionals were not
using plastic linen testers with plastic lenses; we saw the using either the
PEAK® or SPI Supplies® Brand of linen testers.
The linen testers offered by SPI Supplies are of professional quality, each
is handmade using precision tolerances, and is indeed a fine piece of optics.
They are used also by collectors of all types, especially those who
collect stamps and coins, quality inspectors in variety of different
industries, and broad range of hobbyists. The linen testers offered by SPI
Supplies are also used at times by those visually impaired because of their
ease of use for assisting with the reading of a newspaper or magazine.
Microscope laboratory applications:
Linen testers are often times used in microscopy laboratories as an aid for
finding areas of defects for later study at still higher magnifications in
some higher power microscope.
Banking security applications:
Linen testers are also widely used for the detection of counterfeit checks
and counterfeit paper currency.
Handwriting analysis:
These high quality linen testers are also highly valued in any kind of
forensic laboratory for the analysis not only of fabric samples from a crime
scene but also handwriting analyses.
Selection of the "right" model:
A lot of the selection process depends on the personal preference of the
intended user. Generally speaking, for field forensic or quality assurance
applications, the smaller units are preferred since they can be carried
unobtrusively in one's shirt pocket. For the most serious applications,
obviously the larger models are more preferred. The textile industry tends
to have standardized around the use of a 6x linen tester.
Metal vs. plastic frames:
Until recently, all linen testers offered by SPI Supplies were metal frame
construction; professionals demand the precision that is only possible with
a metal frame. Our main market traditionally has been for professionals and
we had not for many years offered lineen testers in plastic frames.
However, for some customers, plastic frames offer some attractions. For
example, they won't "trip" metal detectors at airports and other security
check points. Plastic will not corrode and they are therefore more
desirable when used either outdoors and exposed to moisture or even in
laboratory settings where they could be exposed to corrosive vapors. There
is also the fact that plastic frames are cheaper and are therefore attractive
to science teachers wanting to purchase in quantity for classroom use.
Consequently, SPI Supplies now offers our customers the choose of either
metal or plastic frames, but all do have the same high quality glass lens
optics.
Glass vs. plastic lenses:
Professionals want no distortion and that is possible only with lenses made
of glass, not plastic. Also, glass is much more scratch resistant than plastic
and will last much longer. True, plastic is a bit cheaper. But, our customers
demand the image quality that is possibly only with glass lenses, and for that
reason we do not offer linen testers (as to others) with cheaper but inferior lens.
Quantity discounts:
Purchase 10 or more of the same identical product and the Shopping Cart will
automatically apply a 10% discount. For purchases of 100 or more of the same
item, contact SPI Supplies directly, being sure to give us the SPI # of the
product desired and the number desired. In order to enter the quote into
our system, we will need to have full institutional affiliation, address,
city, country, and phone and FAX numbers.
Choose from a variety of different linen testers:
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Tuesday February 09, 2010
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