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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Instruments HW30 HeatWatch Humidity and Temperature Stopwatch

Instruments HW30 HeatWatch Humidity and Temperature Stopwatch

Product ID: 277197602

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Details

Colour
Green
Brand
Extech
Material
Plastic
Product dimensions
6.6D x 7.9W x
Item weight
0.02 Kilograms

📅Full calendar display

⏱️1/100 sec stopwatch precision

🌡️Temp & humidity readout

Description

⏱️ Stay ahead of time and climate — because every second and degree counts!

ALL IN ONE TIMEKEEPER - Switch effortlessly between 12/24 hour clock modes and calendar views for seamless scheduling.
DATA AT YOUR FINGERTIPS - Fast lap recall and multi-function display keep critical info accessible for professionals on the move.
PRECISION TIMING MASTERY - Track every split with 1/100 second stopwatch accuracy and 99 lap memory for your fastest, slowest, and average times.
CLIMATE INSIGHT ON THE GO - Instantly monitor temperature, humidity, and heat index to stay ahead in any environment.
COMPACT LIGHTWEIGHT DESIGN - Weighing just 20g with a sleek green casing, it’s built for portability without sacrificing durability.

The Extech HW30 HeatWatch combines precise 1/100 second stopwatch functionality with real-time temperature, humidity, and heat index monitoring. Featuring a 99 lap counter with fastest/slowest/average lap recall, dual 12/24 hour clock modes, and a calendar display, this compact 20g device is engineered for professionals who demand accuracy and environmental awareness in one sleek tool.

Specifications

Brand	Extech
Model Number	HW30
Color	Green
Product Dimensions	7.87 x 6.6 x 2.03 cm; 20 g
Material	Plastic
Item Weight	20 g

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