How to Choose the Right Cable Fault Locator: TDR vs Bridge vs Acoustic TDR (Time Domain Reflectometry) Best for pre-location. Sends low-voltage pulse, measures reflection. Fast and accurate. A10 ($2,500) Bridge Method Best for high-resistance faults. Compares resistance of faulted vs good phase. MB10 ($10,000) Acoustic-Magnetic Best for pinpointing exact location. Detects sound and magnetic field of discharge. C11 ($2,000) Starter Package ($5,200): A10 +C11 + A30D. Covers 90% of field scenarios. Get a Quote →