Megger DET24C Clamp-On Earth TesterSpecifications :Induce a test current into earth systems to measure ground resistance in multi-ground installations without the need to disconnect ground Ideal for measuring earth resistance in various installations such as buildings, pylons and RF transmitter sites without system disconnection Upgraded version of the DET14C with Bluetooth wireless transfer to PC, advanced memory storage with download and compatibility with Megger PowerDB and PowerDB Lite software Clamp head suitable for cables with diameter of up to 37mm and earth tapes with diameter of 50mm Operate in darkened areas using the backlit display Automatic current measurement safety features Automatic self calibration Auto-ranging High and low alarms Real-time clock date and time stamps results