Monitor shows current, minimum, and maximum displays and includes a settable high/low alarm for all four readings (dew-point, wet-bulb, humidity, temperature). Alarm may be set in 0.1 increments, it sounds for one minute and red LED flashes until readings return to non-alarm condition. Meets federal requirements for CLIA specification 493.1207 for monitoring temperature and humidity. Supplied with two AA alkaline batteries for continuous, 1-year "always on" monitoring, and Traceable® Certificate. LCD digits are 1-inch-high. Case is high-impact, chemical-resistant ABS plastic.