Inventory: It means stock of a goods.
Scale: Its used to measure cloths or some other materials.
Measure: If you find the length and breath of a plot or a place is called measure.
Questionnaire: If you want to contact a test or do you want to do a research or study the prevalence or incidence of a particular disease or RTA or some other topics, first step is to frame a set of questions related to that study topic and go to the field and collect the data related to that particular study..
The big problem is that this terms are not used (in psychology) in a consistent way.
inventory, sacle and questionnaire are used interchangeable to mean tools for data collection.
A measure is the product of the data coletion. For example, it is assumed in clasical test theory that the sum of item scores (total score) is a measure of a construct. More exactly, we infer a measure of the construct from that score
Take a look:
https://www.researchgate.net/publication/280600437_Inventory_Valuation_Practices_A_Developing_Country_Perspective?ev=prf_pub
Article Inventory Valuation Practices: A Developing Country Perspective
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