Electro-Technic manufactures four portable holiday detectors also known as pinhole testers, porosity detectors, and spark testers: BD-10, BD-40, BD-50, BD-60. We also make a customizable automated model (BD-65) to suit specific customer applications and test materials. Our introductory BD-10 model is intended for light/intermittent use while our BD-50/BD-60 models are more suited for continuous heavy duty use. Our model BD-40 has a limited voltage output suited for thin/sensitive linings. Each model comes with a detachable pointed electrode tip. Other types of electrode accessories are available.