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MET Labs is your expert source for accelerated product evaluation, testing & certification for power tools and power tool accessories.
Publish Date: Dec 28, 2010 | 57 Ratings | 3.70 out of 5 | Print. Electrical test & measurement tools will be assigned to 4 different designations from I - IV. These categories can be confusing; therefore, National Instruments has developed this tutorial to help customers understand what these categories mean. Tools that interact with electricity are designed for specific applications and conditions.