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SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration

SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration

Q: Does this display Humidity or does it display Relative Humidity?

From the Amazon product page, Specifications: "Humidity Range: 1~99%RH(relative humidity)". The Amazon page mentions "RH" at least 9 times, strongly suggesting that is what it displays. Additionally, humidity is the amount of water vapor in a unit volume of air (independent of temperature) which is expressed in kilograms per cubic meter. Relative Humidity is the PERCENTAGE of the maximum amount of water vapor in the air, possible at that temperature. Because the Hygrometer reports a percentage, not a mass per volume, there can be no confusion. RH is what you want for controlling comfort and environmental conditions (mold growth, etc,).

Q: Can this be calibrated if needed?

You can only calibrate if you have a standard that is accurate. You can adjust the reading up and down. I have 7 of these so I put them all in the same room for about 6 hours and I adjusted mine so it matched the rest. The rest were within 2 of each other, this one was 4 so I made it like the others.

Q: can you make the light stay on?

Not as far as I can see. Just a very light tap on the top of the frame will light it up for about ten seconds. That seems more than enough IMHO. If left on too much, the battery would drain sooner. Just a very very light tap.

Q: Your product information states: "calibration certification from aerospace institute for metrology and measurement technology" missing cert. doc?

I have never looked for any certification's. I did a comparison test with 4 different instruments and liked this model best, so I purchased 4 or 5 of them. They have been working fine in my home and hobby woodworking shop.

4.6/5

Product ID: 395039719

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Details

Colour
black
Brand
SMARTRO
Product Dimensions
8.6W x 8.6H
Item Weight
0.13 Kilograms
Battery Description
2x1.5v AAA

📊±0.5℉ & ±2%RH accuracy

⏱️10-sec update rate

🖥️3.5'' HD backlit display

Frequently Bought Together

SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge Pro Accuracy Calibration

ThermoPro TP55 Digital Indoor Hygrometer Thermometer, 4-Inch Temperature / Humidity Monitor with Touchscreen and Backlit, Indoor Room Thermometer / Humidity Meter for House Home Greenhouse

ThermoPro TP50 Digital Hygrometer Indoor Thermometer Room Thermometer and Humidity Gauge with Temperature Monitor

Description

🌡️ Stay ahead of the curve with precision you can trust!

PRECISION SWISS SENSORS - Experience industrial-grade accuracy with readings updated every 10 seconds for real-time climate control.
24 HOUR MAX MIN TRACKING - Stay ahead of environmental changes with all-time and daily high/low temperature and humidity records.
MANUAL CALIBRATION SUPPORT - Fine-tune your device for pinpoint accuracy, ensuring your environment is always perfectly balanced.
VERSATILE MOUNTING OPTIONS - Magnetic, wall-mount, or tabletop placement adapts seamlessly to your workspace, nursery, or wine cellar.
CRYSTAL CLEAR BACKLIT DISPLAY - Large 3.5-inch HD screen with touch-activated backlight ensures effortless monitoring anytime, even in low light.

The SMARTRO SC42 is a professional-grade digital hygrometer and thermometer featuring Swiss sensors for ±0.5℉ temperature and ±2%RH humidity accuracy. It updates readings every 10 seconds on a large 3.5-inch backlit LCD, tracks 24-hour max/min records, and offers versatile mounting with manual calibration support—ideal for maintaining optimal indoor environments.

Specifications

Colour	black
Brand	SMARTRO
Product Dimensions	8.6W x 8.6H Centimeters
Item Weight	0.13 Kilograms
Battery Description	2x1.5v AAA batteries
Mounting Type	Wall Mount
Operating Humidity	1-99% with a +/- 2%RH tolerance
Upper Temperature Rating	158 Degrees Fahrenheit
Voltage	3.0
Manufacturer	SMARTRO
Country of Origin	USA
Item model number	SC42
ASIN	B07YY1FB9D

Have a Question? See What Others Asked

Does this display Humidity or does it display Relative Humidity?

Can this be calibrated if needed?

can you make the light stay on?

Your product information states: "calibration certification from aerospace institute for metrology and measurement technology" missing cert. doc?

Common Questions

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