---
product_id: 395039719
title: "SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration"
brand: "smartro"
price: "28239 Ft"
currency: HUF
in_stock: true
category: "Smartro"
url: https://www.desertcart.hu/products/395039719-smartro-sc42-professional-digital-hygrometer-indoor-thermometer-room-humidity-gauge
store_origin: HU
region: Hungary
---

# 3.5'' backlit HD display ±0.5℉ & ±2%RH accuracy 10-sec update speed SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration

**Brand:** smartro
**Price:** 28239 Ft
**Availability:** ✅ In 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?** 28239 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/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

- • **Effortless Visibility:** Large 3.5-inch HD backlit screen ensures clear readings even in low light, saving you time and guesswork.
- • **Precision Swiss Sensors:** Experience industrial-grade accuracy with ultra-sensitive humidity and temperature detection updated every 10 seconds.
- • **Comprehensive Data Tracking:** Track 24-hour and all-time max/min temperature and humidity records to stay ahead of environmental changes.
- • **Versatile Placement Options:** Mount it on your wall, fridge, or desk with magnets, stand, or wall hole—perfect for any professional or home setting.
- • **Custom Calibration Capability:** Manually calibrate your device for pinpoint accuracy tailored to your unique environment and needs.

## Overview

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 HD display, tracks 24-hour and all-time max/min records, and offers versatile mounting options. Manual calibration ensures tailored precision, making it ideal for offices, nurseries, wine cellars, and more.

## Description

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

## 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 |
|---------------|-------|
| 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 |
| Temperature Accuracy | 0.2778 degrees_celsius |
| Manufacturer | SMARTRO |
| Country of Origin | USA |
| Item model number | SC42 |
| ASIN | B07YY1FB9D |

## 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/514tJF1CtpL.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 4](https://m.media-amazon.com/images/I/516a2HdHtfL.jpg)
![SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge & Pro Accuracy Calibration - Image 5](https://m.media-amazon.com/images/I/51F5n0jC5AS.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.

## 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

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hu/products/395039719-smartro-sc42-professional-digital-hygrometer-indoor-thermometer-room-humidity-gauge](https://www.desertcart.hu/products/395039719-smartro-sc42-professional-digital-hygrometer-indoor-thermometer-room-humidity-gauge)

---

*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-01-24*