Linen tester [Thread counter] 6x Ø 27mm - LED+

Product No.:: 1406182
On Stock:: Available! (approx. 2-3 days)
Stock:: pieces

Model:

£ 14.12

excl. Shipping costs

Description

Choose between the following:

Thread counter without LED (1406182)
Thread counter with 2 LEDs (1406183), 2 batteries (CR 1216) included

Technical Specifications
Product Number	1406182	1406183
Magnification	6x	6x
Lens type	biconvexe	biconvexe
Lens material	glass	glass
Lens diameter	Ø 27mm	Ø 27mm
Scale metric	mm/inch	mm/inch
Length of scale	25mm	25mm
Scale graduation	1mm / 1 inch	1mm / 1 inch
Foot opening	25.7x25.7mm	25.7x25.7mm
Weight	108g	108g
Material	metal	metal
Dimensions	55x37x24mm	55x37x31mm
Packaging	—	—
Max Print Area	—	—

Technical Specifications

Technical Specifications
Product Number	1406182	1406183
Magnification	6x	6x
Lens type	biconvexe	biconvexe
Lens material	glass	glass
Lens diameter	Ø27mm	Ø27mm
Scale metric	mm/inch	mm/inch
Length of scale	25mm	25mm
Scale graduation	1mm	1mm / 1 inch
Foot opening	25.7x25.7mm	25.7x25.7mm
Weight	108g	108g
Material	metal	metal
Dimensions	55x37x50mm	55x37x50mm

Biconvexe Lens

Biconvex lenses are also called convexo-convex lenses and are mainly made out of a special quality glass. Different types of biconvex-lenses exist such as the planconvex-lens. The most common biconvex lens is the symmetric-convex lens as used in this magnifier.

The biconvex lens is manufactured with identical convex surfaces each side of the lens. The focal length is equal to the radius of the curvature. Resulting from its perfect symmetry it produce images close to 1 and up to a magnification of 8x. Biconvex lenses have positive focal lengths and form both real and virtual images.

Aberrations such as coma, distortion, and chromatic aberration almost exactly cancel out also due to the symmetry.