Megger 1000 215 etl30 extension test lead on reel megger 1000 215 the megger etl30 30m extension test lead is a convenient and compact long test lead designed for direct continuity measurement of r2 values this compact 30m extension test lead eliminates the need for crossover connections for r1 r2 measurements by providing a single r2 value the furthest point in the circuit can be easily verified and every earth point on the circuit checked for integrity prior to energising ideal for che