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The Marketing Scales website is a gold mine of information.  It is the only source that helps me understand the psychometric quality of the instruments used in past research.  I recommend that researchers bookmark this site . . . they will be back!
Bob Moritz
Marshfield Clinic Research Foundation

knowledge

This scale has three, seven-point Likert-type items that measure a consumer’s beliefs that he/she has insight into the characteristics, quality, and aesthetics of an object.

The extent to which a person believes he/she has what it takes to make wise financial decisions, especially with respect to investments, is measured with five, seven-point Likert-type items. 

How much one’s uncertainty about something is determined to some degree by randomness is measured with three, five-point Likert-type items.  The scale is amenable for use with a wide variety of issues.

Three, five-point Likert-type items are used in this scale to measure the degree to which a person believes that something in the future which is currently uncertain can be more accurately predicted with enough information.  The scale is amenable for use with a wide variety of issues.

This scale uses five, seven-point items to measure a person’s belief in his/her ability to operate manual and automatic transmission automobiles.  (Two items refer to driving a manual transmission vehicle while the other three items are relevant for either type.)

The extent to which a person believes that he/she knows what a company does and can describe them to others is measured with four, seven-point Likert-type items.

The degree to which a customer believes a service provider is the best is because it understands his/her needs better than the others.  The scale is composed of three, seven-point Likert-type items.

The scale measures the degree to which a person believes a particular candidate has positive attributes such as sincerity and knowledgeability that make him/her qualified for the political office.

The degree of certainty a person has in the appropriateness of a particular choice in which one option was selected over another one (explicitly stated) is measured in this five-item Likert scale.

Using three, seven-point items, this scale measures how much a person feels uncertain about a choice he/she has made.