Fluke 1664 FC - Mains Wiring Indicator; Quick Start; How to Use the Rotary Dial

Electrical Installation Tester
Operation
9
Mains Wiring Indicator
Icons (, b, c) indicate if L-PE or L-N terminals are reversed.
Instrument operation is inhibited and an error code is generated if the input
voltage is not between 100 V and 500 V. The UK Loop and RCD tests are
inhibited if the L-PE or the L-N terminals are reversed.
When a high voltage is measured between two wires,  shows on the
display. See How to Test a Mains Socket and Ring Installation for more
information.
Quick Start
This section is information that introduces you to the controls and inputs of
the Tester. You will also find information about functions that apply globally
as you use the Tester.
How to Use the Rotary Dial
Use the rotary dial (see Table 5) to select the test type.