If a push button set produces dial pulses when the keypad is operated, the set is not really a tone set. When the keypad is operated, numbers are pulsed out just like a standard rotary dial. The Leviton Tone Test Set is equipped for polarity testing with a visual indicator. If this polarity test is performed with the toner connected to a pair using the test clips instead of the modular plug, you must be certain you are connecting the leads to the proper conductor. Polarity will sometimes be reversed by the central office during completion of a call.
Some people prefer to test polarity with a buttset and tone test set, without dial tone connected.
There are several methods that will work. In this setting, the battery inside the unit is connected to the test leads. Connect the red test lead to ring, and the black lead to tip of the pair under test. Clip on the buttset with the switch in the monitor position. Using a modular breakout adapter, you can plug directly into each device and connect the buttset leads to the adapter.