The Rapid RH L6 Insertion Tool is newly designed to provide simpler, more ergonomic Smart Sensor insertion for relative humidity (RH) testing in concrete slabs with the Rapid RH test method. The Rapid RH L6 Insertion Tool is newly designed to provide simpler, more ergonomic Smart Sensor insertion for RH testing in concrete slabs with the Rapid RH test method. Allows installers to know when they have a correctly-sized, straight, uniformly round test holes. Multi-stepped and multipurpose, the new insertion tool completely syncs with the current model Total Reader for complete compatibility with the Rapid RH system. The Insertion Tool measures 6-3/4" and provides both test hole verification and worry-free Wagner Meters Smart Sensor probe installation.