---
product_id: 395039719
title: "SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration"
brand: "smartro"
price: "R$478"
currency: BRL
in_stock: false
reviews_count: 13
category: "Smartro"
url: https://www.desertcart.com.br/products/395039719-smartro-sc42-professional-digital-hygrometer-indoor-thermometer-room-humidity-gauge
store_origin: BR
region: Brazil
---

# ±0.5℉ & ±2%RH accuracy Battery-powered portability 10-sec update rate SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration

**Brand:** smartro
**Price:** R$478
**Availability:** ❌ Out of Stock

## Summary

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

## Quick Answers

- **What is this?** SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration by smartro
- **How much does it cost?** R$478 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/395039719-smartro-sc42-professional-digital-hygrometer-indoor-thermometer-room-humidity-gauge)

## Best For

- smartro enthusiasts

## Why This Product

- Trusted smartro brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Precision Swiss Sensors:** Experience industrial-grade accuracy with real-time updates every 10 seconds.
- • **Pro Calibration Support:** Manually calibrate for pinpoint accuracy tailored to your unique environment.
- • **24-Hour Max/Min Tracking:** Stay ahead of environmental changes with continuous high and low records for optimal comfort control.
- • **Versatile Mounting Options:** Magnet, wall mount, or stand—seamlessly integrate into any space from nursery to wine cellar.
- • **Vibrant 3.5'' Backlit Display:** Effortlessly monitor temperature and humidity even in low light with a power-saving touch-activated screen.

## Overview

The SMARTRO SC42 is a professional-grade digital hygrometer and indoor thermometer featuring Swiss sensors for ±0.5℉ temperature and ±2%RH humidity accuracy. It updates readings every 10 seconds on a large 3.5'' backlit LCD, tracks 24-hour max/min records, and offers versatile mounting with magnets, wall hooks, or a stand. Manual calibration ensures tailored precision, powered by 2 AAA batteries for flexible placement across homes, offices, and specialized environments.

## Description

SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration : desertcart.in: Home & Kitchen

Review: Nice product - Good 👍😊
Review: Looks great - Nice product. New experience

## Features

- The Best Industrial Grade Accuracy: Humidity gauge with built-in Swiss sensors, it detects subtle humidity and temperature changes and updates readings in each 10 seconds. Temperature tolerance is within 0.5℉(-4 to 158℉) and humidity is 2%RH (1 to 99% RH). The digital hygrometer is pre-calibrated for accurate temperature and humidity measurement.
- Easy-to-Read Backlit Display: Temperature and humidity monitor with 3.5'' large HD LCD screen. A simple touch on the top will turn on backlit for 10 seconds. Clear and power-saving, reading more easily under weak backlit. Reliable operating buttons on the back for manual setting or °F/°C switching. Note: The backlit in the pictures is all in ON state. The backlit is not always on.
- 24 Hours All-time Max Min Records: The room thermometer displays high and low records for the past 24 hours and All-time; Indoor thermometer measure conditions and identify changes in temperature and humidity instantly. Comfort Indicator ensures proper humidity control, helping you to maintain a comfortable atmosphere in your home.
- Wide Applications with More Mounting Options: With a retractable stand, two powerful magnets and a wall-mount hole, this digital thermometer indoor can be easily attached to your refrigerator, wall or placed on a table. Suitable for baby’s room, nursery, office, closet, incubator, greenhouse, garden, wine cellar, basement critter terrarium etc. Note: This thermometer cannot connect to phones.
- Calibration Supported: The monitor can be manually calibrated to improve data readings when product placement or environmental factors impact your data accuracy. Powered by 2x1.5v AAA batteries (not included).

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07YY1FB9D |
| Battery Description | 2x1.5v AAA batteries |
| Best Sellers Rank | #147,495 in Garden & Outdoors ( See Top 100 in Garden & Outdoors ) #202 in Indoor Thermometers |
| Brand | SMARTRO |
| Colour | black |
| Country of Origin | USA |
| Included Components | 1 thermometer 1 manual |
| Item Weight | 130 g |
| Item model number | SC42 |
| Manufacturer | SMARTRO |
| Mounting Type | Wall Mount |
| Net Quantity | 4.64 Grams |
| Operating Humidity | 1-99% with a +/- 2%RH tolerance |
| Product Dimensions | 8.6W x 8.6H Centimeters |
| Temperature Accuracy | 0.2778 degrees_celsius |
| Upper Temperature Rating | 158 Degrees Fahrenheit |
| Voltage | 3.0 |

## Product Details

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

## Images

![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 1](https://m.media-amazon.com/images/I/41CNsYGYK8L.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 2](https://m.media-amazon.com/images/I/41v2jUz0P0L.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 3](https://m.media-amazon.com/images/I/41yMcbtTPyL.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 4](https://m.media-amazon.com/images/I/514tJF1CtpL.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 5](https://m.media-amazon.com/images/I/516a2HdHtfL.jpg)

## Questions & Answers

**Q: Does this display Humidity or does it display Relative Humidity?**
A: 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?**
A: 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?**
A: 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?**
A: 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice product
*by R***I on 13 December 2025*

Good 👍😊

### ⭐⭐⭐⭐⭐ Looks great
*by R***U on 25 November 2025*

Nice product. New experience

### ⭐ Waste of money
*by P***O on 1 December 2025*

Waste of money as the display automatically turn off in 10 seconds and it becomes a sitting block of metal on desk. Cannot be returned either due to buying policies. It’s a desk clock and you have to press a button to check the time. 😭😭

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-01-27*