--Compatible with Protimeter Connect App\n--Dual mode for sub-surface and surface monitoring\n--Non-intrusive radio frequency moisture measurement \n--Resistance moisture measurement\n--Includes deep wall probes\n--LED/LCD display with adjustable brightness The Protimeter Surveymaster is an enhanced version of the Protimeter Mini. In addition to the pin- type \u201Cresistance\u201D measurement provided by the Mini, the Surveymaster benefits from a non-destructive radio- frequency based \u201Csearch mode\u201D. This allows measurements to be taken without damaging d\u00E9cor and also allows measurements to be taken below the surface of the substrate.\nThis upgraded version of the Protimeter Surveymaster offers 3 times longer battery life, integration with Protimeter Connect App for photos, readings and geolocation recording.\nBecause of its enhanced functionality and excellent build quality, the Protimeter Surveymaster is widely regarded as the industry standard moisture met.