The Monoprice Lineman s Test Set is a professional piece of equipment designed for telephone installers; repair technicians; and phone system maintenance personnel. This durable; line-powered device is full of features for testing existing and newly installed communications systems for proper functionality. The bright red handset is both impact and water resistant. The rubber-covered keypad and large slide switches are designed for use with gloves; making this a convenient tool for line workers. The large; heavy-duty alligator clips support five different types of wire connections; including a bed-of-nails and an insulation piercing spike. The connecting cord is covered in cloth for durability and is equipped with a strain-relief connection at the RJ11X connector. A heavy-duty; spring-loaded belt clip allows the handset to be conveniently hung from a maintenance belt. The tester has a three-position volume switch; which can provide up to 12 dB of volume gain. The ring mode can be set to send either DTMF tones or rotary dial pulses. A three-position mode switch allows the tester to be set to Monitor; Ring; or Talk modes: The Monitor mode provides a high-impedance coupling to the telephone line; allowing it to be monitored without interfering with existing conversations; data transmissions; or signalling. The Ring mode allows the tester to be on-hook with an electronic ringer connected to the telephone line. This provides a low-impedance coupling to the telephone line for monitoring of optional line identification tones. The Talk mode allows the technician to seize the line or initiate signalling. From this mode a number can be dialed using the keypad. Hanging up the line is as simple as switching to the Ring or Monitor mode. The handset includes an automatic last-number redial function; which is capable of repeating up to 31 digits. It also features a number memory storage capability; allowing the technician to store up to 10 different numbers of up to 15 digits each