Science Fair Project Encyclopedia
A product with Underwriters Laboratories approval is said to be "UL-rated." Purchasers can identify such products by the distinctive UL Mark , accompanied by a serial number.
UL has ratings standards for many products, even bullet-proof vests. The average householder may be more familiar with UL-rated products such as home electrical appliances.
A moderately famous video clip shows UL researchers demonstrating the risks of certain models of deep-fat turkey fryer. This serves as a suggestion of the importance of this sort of product testing. 
The European analog of the UL mark is the CE logo.
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