A Bettsometer is a fabric

Fabric

A fabric is a textile material, short for "textile fabric".Fabric may also refer to:*Fabric , the spatial and geometric configuration of elements within a rock*Fabric , a nightclub in London, England...

 degradation tester

Test method

A test method is a definitive procedure that produces a test result.A test can be considered as technical operation that consists of determination of one or more characteristics of a given product, process or service according to a specified procedure. Often a test is part of an experiment.The test...

 commonly used to measure

Measure

- Legal :* Measure of the Church of England is a law passed by the General Synod and the UK Parliament equivalent of an Act* Measure of the National Assembly for Wales, a law specific to Wales passed by the Welsh Assembly between 2007 and 2011...

 or test the integrity of fabric coverings (and associated stitching) on aircraft

Aircraft

An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

 and their wing

Wing

A wing is an appendage with a surface that produces lift for flight or propulsion through the atmosphere, or through another gaseous or liquid fluid...

s.

The Bettsometer comprises a pen

Pen

A pen is a device used to apply ink to a surface, usually paper, for writing or drawing. Historically, reed pens, quill pens, and dip pens were used, with a nib of some sort to be dipped in the ink. Ruling pens allow precise adjustment of line width, and still find a few specialized uses, but...

-like instrument (which functions much like a spring balance) and a smooth round needle

Needle

-Crafting:* Knitting needle, a tool for knitting, not as sharp as a sewing needle* Sewing needle, a long slender tool with a pointed tip* Upholstery needle, a tool for upholstery, generally thick and curved-Botany:* Pine needle, the adult leaf of a pine tree...

 or pin. The needle is inserted into the fabric and then the instrument is pulled to exert a specific force

Force

In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity , i.e., to accelerate, or which can cause a flexible object to deform...

 on the fabric in order to test. A visual inspection is made to check for any rips or tears at the needle insertion point.

The Bettsometer test is often a requirement for the annual 'permit

Permit

Permit may refer to:*Permit *Various legal licenses:*License*Work permit*Learner's permit*Permit to travel*Construction permit*Home Return Permit*One-way Permit*Permit is the common name for the Trachinotus falcatus, a type of Pompano....

' renewal and is usually carried out by an aircraft inspector

Inspector

Inspector is both a police rank and an administrative position, both used in a number of contexts. However, it is not an equivalent rank in each police force.- Australia :...

who will know the requirements of the test (i.e. the areas of sail and stitching to be tested and the force to be exerted).