Provides basic operation tests for corded and cordless telephones, answering machines, fax machines and automatic dialers Checks line and handset cord for continuity, shorts and intermittents Verifies number dialed or redialed (pulse or Touch Tone®) Verifies that voice and DTMF levels are above minimum required level Provides low and normal ring tests Tests two-line phones Tests automatic polarity circuit in telephone, assuring that telephone will work if polarity of telephone is reversed.