Made from high grade ABS plastic, these units display temperature and humidity simultaneously. Easy installation with no wiring, using a mounting opening of 33mm (1.3”) diameter and mounting thickness of 7mm (0.28”). CE marked and RoHS compliant. Supplied with multi-language (English, French, German, Italian, Portuguese and Spanish) instructions and Statement of Traceability including accuracy traceable to NIST. Requires 1 CR2032 battery (included).