Megger’s popular 4-terminal ground testing instrument family includes four basic models with different kit variants for each that include select accessories for greater testing flexibility.The four basic units are:DET4TD2 Dry-cell battery powered basic 4-terminal tester DET4TR2 Rechargeable battery powered basic 4-terminal tester DET4TC2 Dry-cell battery powered 4-terminal tester with selectable test frequencies, greater measurement sensitivity and attached rod technique and stakeless measurement capabilit DET4TCR2 Rechargeable battery powered 4-terminal tester with selectable test frequencies, greater measurement sensitivity and attached rod technique and stakeless measurement capability• 2, 3 and 4 point testing • Stakeless (clamp-on) testing capability • ART (Attached Rod Technique) capability • Multiple, user selectable test frequencies • Resistance measurement range to 200,000 ? • IP54 rated • Warning indicators prevent test failure • Simple one button operation