American NovaLynx Relative Temperature and Humidity Indicator
The 225-HM34 relative temperature and humidity indicator incorporates a precise, durable HUMICAP sensor that is insensitive to dust and most chemical contaminants. Both the humidity and temperature sensors are housed in a retractable probe that can be withdrawn into a sturdy plastic case for storage, making it a compact, portable device. It comes with a 9V battery, connected probe, protective membrane filter, and a carrying case.