grt300:4-wire earth ground resistance tester

measures earth ground resistance in 4 ranges from 2 to 2000 ohm

• 4-wire, 3-wire, and 2-wire testing
• large dual line lcd
• automatic i (current) and p (potential) spike check
• test hold function for easy operation
• autoranging, automatic zero adjustment, data hold and auto power off
• ac earth voltage
• overrange and low battery indication
• complete with test leads with alligator clips, 4 auxiliary earth bars, hard carrying case, and eight 1.5v aa batteries