High impedance DataSafe™ operation in Monitor mode DropSafe™ reliability passes 20 foot drop test RainSafe™ protection in severe weather conditions Mute switch Last number redial Audible ringer for callbacks Recognized as the industry standard for basic test sets, the TS30 Test Set provides superior quality at an affordable price. With its high impedance Monitor for DataSafe™ operation, technicians can clip onto a line in Monitor mode without disrupting existing traffic. Fluke Networks' unsurpassed RainSafe™ protection standards and DropSafe™ durability assure the test set will keep working even in the toughest environments. Solid weatherproofing provides enhanced resistance to severe weather conditions.