NovaLynx USA relative temperature and humidity indicator - 225-HM34
The 225-HM34 relative temperature and humidity indicator incorporates a HUMICAP sensor that is precise, durable, and insensitive to dust and most chemical contaminants. Both humidity and temperature sensors are mounted in a retractable probe that can be retracted into the rugged plastic housing for storage, making it a small, portable device. It comes with a 9V battery, connected probe, protective membrane filter, and carrying case.