Leak detectors can be highly accurate in detecting water leaks, particularly if they are used properly and maintained regularly. However, the accuracy of the detector can depend on several factors, including the type of detector, the size and location of the leak, and the experience of the operator. Additionally, some types of leaks, such as those in concealed pipes or in hard-to-reach areas, may be more difficult to detect. Overall, leak detectors are a valuable tool in identifying and repairing leaks, but they should be used in conjunction with other diagnostic methods for the best results.