2% Wall/Outside Humidity Sensor, selectable output with direct 50K ohm thermistor - Buy Online - EC Products UK
Carbon Monoxide Detectors Portable Temperature Detector/Humidity Sensor/Air Quality Meter Smoke CO Gas Monitor [3 in 1] Alarm - K&F Concept
Pocket-size Humidity Detector PCE-HGP
Neoteck Moisture Meter 4 Pin Digital Moisture Meter Damp Detector Humidity Tester for Wood Wall Concrete Plaster Brick Caravans Boats and Other Materials : Amazon.co.uk: DIY & Tools
Digital Humidity Sensor - RHTX 4-20mA RS485 temperature humidity transmitter for greenhouse – HENGKO
Brennenstuhl Moisture Detector Damp Meter Moisture Tester for Wood, Walls, Plaster - Digital LCD Display | DIY at B&Q