NovaLynx USA Relative Temperature and Humidity Indicator - 225-HM34
The 225-HM34 relative temperature and humidity indicator incorporates a HUMICAP sensor that is accurate, durable, and insensitive to dust and most chemical contamination. Both humidity and temperature sensors are mounted in a retractable probe that can be retracted into a rugged plastic housing for storage, making it a small, portable device. Comes with a 9V battery, probe connection, protective membrane filter, and carrying case.