Does this come with a certificate?

Thank you so much for your interest in our products. The 365510 is able to receive a Certificate of Compliance by us after the purchase. Also, if you pay the additional difference, it can receive a traceable NIST calibration certificate. Be sure to check the part number for it 365510-NIST

how quickly do the temperature and humidity readings get updated? in a minute, or in ten? and its real size?

The temperature updates within seconds while the humidity may take a few seconds more to stabilize and prodcue the display.

how tall are the numbers?

Mine, which is a model 365510 has numbers just a shade under 3/8", probably closer to 5/16". I find them adequate for the job at hand.

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⏳ Stay cool, stay precise—time and temperature in perfect sync!

HEAT INDEX INSIGHT - Feel the real heat—combines temperature and humidity for a true comfort reading.
RUGGED RELIABILITY - Built to endure industrial environments without deterioration—your long-term companion.
VERSATILE TIMEKEEPING - Switch effortlessly between 12/24-hour clock formats to fit your schedule.
HANDS FREE CONVENIENCE - Includes lanyard and programmable alarm to keep you on track without missing a beat.
PRECISION TIMING MASTERY - Track workouts or inspections with a 30 lap/split memory stopwatch for ultimate accuracy.

The EXTECH HW30 HeatWatch is a multi-functional stopwatch designed for professionals needing precise timing alongside accurate temperature, humidity, and heat index measurements. Certified to industry standards and built for durability, it features a 30 lap memory, programmable alarm, and versatile clock formats, making it ideal for both industrial inspections and fitness tracking.