Eyepiece Reticles from Graticules Ltd.
Squares and Grids
Special note of caution:
The products on this page may need to be calibrated, according to the intended use. There are a number of different patterns listed, which are used in a variety of different applications, and the exact calibration strategy should be determined by the user's particular application. We want to stress that these reticles are intended to be used with microscope eye-pieces and were not designed for use with magnifiers.
Sectoring:
A squared reticle might be used for the systematic examination of a specimen. Some of the squared patterns are numbered to aid in the identification of areas of interest. Sectoring is particularly useful for making drawings of specimens onto graph paper. The chessboard type of pattern helps the user to distinguish the position being examined; the darker squares are translucent, which the lighter ones are transparent, avoiding eye strain in prolonged counting sessions as may be necessary in hematology applications. These patterns provide the same advantages when used with image analysis and capture devices.
Counting:
A squared reticle can be used for counting. Here the basic principle is that a small area of the specimen is analyzed in order to obtain information about the total area. This minimizes sometimes wasteful work, thereby enabling simple analysis of a particular area. An example of this would be the comparison of large to small particles in a specimen. By using the Miller reticle (Style NE57) only the smaller particles in the small square are counted, the result being multiplied by ten for comparison with the number of larger particles in the large square.
Squared Grids:
Squared grids can be used in particle size analysis as simple technical aids where sophisticated image analysis systems are not required. The areas of the particles to be measured can be estimated by simply counting the number of squares occupied by those particles. If is necessary to estimate fractions of a square or make a rule (e.g. count as a square all partly covered squares at the left and upper side of the square). This method would only be useful for a fairly crude estimation of a large diameter. For more detailed optical analysis it is advisable to use a specialized reticle such as those on the Particle Size Analysis page.
Grid (net) 1.0 mm pitch, surface chrome image.
Pattern NE11
SPI #
Each
In Stock
16 mm
GR01B16209-AB
$ 111.29
No
19 mm
GR01B19209-AB
111.29
No
21 mm
GR01B21209-AB
111.29
No
Grid (net) 0.1 mm squares, surface chrome image.
Pattern NE34
SPI #
Each
In Stock
16 mm
GR01B16300-AB
$ 140.57
No
19 mm
GR01B19300-AB
140.57
No
21 mm
GR01B21300-AB
140.57
No
Indexed Grids
These patterns are useful for particle counting, especially where reference is needed between different analysts. This pattern is also useful where one needs to calculate the area covered by a sample.
Numbered grid 5mm x 5 mm. 0.5 mm pitch. Index marked prominently 1-10 and A-J.
Surface chrome image.
Pattern NE10A
SPI #
Each
In Stock
16 mm
GR01B16208-AB
$ 105.42
No
19 mm
GR01B19208-AB
105.42
No
21 mm
GR01B21208-AB
105.42
No
Numbered grid 5mm x 5 mm. 1.0 mm pitch. Index marked prominently 1-10 and A-J.
Surface chrome image.
Pattern NE11A
SPI #
Each
In Stock
16 mm
GR01B16210-AB
$ 99.57
No
19 mm
GR01B19210-AB
99.57
No
21 mm
GR01B21210-AB
99.57
No
Numbered grid 1 mm x 1 mm. 0.1 mm squares. Index marked prominently 1-10 and A-J.
Surface chrome image.
Pattern NE34A
SPI #
Each
In Stock
16 mm
GR01B16220-AB
$ 140.57
No
19 mm
GR01B19220-AB
140.57
No
21 mm
GR01B21220-AB
140.57
No
Chessboard Squares
The dark squares are translucent. This pattern is used as an alternative to simple grids for area of specimen determination and particle counting. Most users report that the alternative light and dark squares help to reduce eye strain after working long periods without resting.
Chessboard (net) 2.0 mm squares, surface chrome image.
Pattern NE15
SPI #
Each
In Stock
16 mm
GR01B16211-AB
$ 292.83
No
19 mm
GR01B19211-AB
292.83
No
21 mm
GR01B21211-AB
292.83
No
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Thursday August 28, 2008
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