The RD547 from Radiodetection Corporation is a single control unit capable of both acoustic and tracer-gas methods of water leak detection. For acoustic methods, it has high listening capabilities and supports three different microphones. Optimized for flexibility, the universal microphone has a selection of attachments making it suitable for ground measurements or attaching to pipe fittings. The ground microphone (geophone) has a windproof shield for outdoor use and is sensitive to lower frequencies. A test rod with a rigid handle and extendable tips allows measurements to be taken on deeper-set utility fittings. When tracer gas offers a better option, a ground sensor for the detection of hydrogen can be attached. Six kit options are available. 877/247-3797; www.radiodetection.com.