Fluke 15B User Manual page 17

Overvoltage installation categories per
IEC 61010-1, 2000:
The Meter is designed to protect against transients in these categories:
CAT II From equipment supplied from the fixed installation, e.g., TVs, PCs, portable
tools and household appliances.
CAT III From equipment in fixed equipment installations, e.g., installation panels,
feeders and short branch circuits, and lighting systems in large buildings.
Multimeters
General Specifications
13