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Results at a Glance
Build Quality
Thick plastic outer shell that can take a bit of light abuse.
Ease of Use
App setup was fast, easy, & intuitive. Everyday use is a breeze.
Accuracy
Needed a 1.3% calibration initially–well within normal limits.
Features
Free phone app that shows trends, sends alerts, and more.
Price
On the higher end of the price scale, but the value is there.
What I Liked
- Small size
- Setup and sync with the free phone app was intuitive and user-friendly
- I can monitor my guitar room’s humidity from anywhere in my house
- Ability to set custom push notifications (alerts)
What I Didn’t Like
- Nothing. Nada. Zip.
For years I’ve used good ole LED-display digital hygrometers to monitor the humidity in my music room and inside my guitar cases. They’ve been fine and done their job.
The downsides to standard hygrometers is that you’ve gotta go into your music room or open your guitar case to read them. Also, these hygrometers definitely aren’t going to alert you if the humidity becomes too high or low.
I’ve been wanting a better solution to come along. I want to monitor temperature and humidity in my music room at any time via my iPhone. I also want to be alerted when something isn’t right (e.g. my room humidifier runs out of water).
This is where the SensorPush HT1 Wireless Humidity & Temperature Smart Sensor comes in. It’s a mouthful, but it’s a tiny little thing, and I’ve had my eye on them for years now.
I finally got one and have been living with it for several weeks now, and figured I’d let the world know what I think of it.
The SensorPush HT1 Wireless Humidity & Temperature Smart Sensor
In a nutshell, the SensorPush HT1 is a tiny temperature and humidity sensing unit that sends information in 1-minute intervals via Bluetooth to the free SensorPush iPhone or Android app.
There’s really not much to the sensor itself. It’s a small plastic device that you place wherever you want to keep tabs on humidity and temperature. There’s no visual display on the sensor.
Instead, the free companion smartphone app displays current and historic humidity and temperature information. You can also configure the app to send email or phone alerts, but we’ll talk more about all that later.
SensorPush HT1 Quick Specs
- Sensor Dimensions: 1.57in x 1.57in x 0.65in (40mm x 40mm x 16.5mm)
- Weight: 40g / 1.4oz
- Battery Life: 1-2 years in normal conditions, less in extreme cold
- Compatibility: iOS 11+, Android 5.01+. Requires Bluetooth 4.0+ (also known as Bluetooth LE)
- Temperature Range: -40°C to 60°C (-40°F to 140°F)
- Humidity Range: 0 – 100%
- Line-of-Sight Range: Up to 325ft.
- 20-day history of temperature and humidity readings
- An unlimited number of sensors can be paired with the app
- Monitoring, custom alerts, etc. are accomplished using the free SensorPush iPhone or Android app.
- Can be paired with the SensorPush G1 WiFi Gateway to allow you to monitor temperature and humidity from anywhere you have internet access
Other Similar Products (Competitors)
Search Amazon for “wireless hygrometer thermometer” and you’ll find a few other options similar to the SensorPush. So, I’ve listed a couple here. However, note that I have no experience with the following and therefore can’t vouch for their quality or reliability:
As always, please do your homework and read reviews carefully before purchasing these or any alternative that I’ve not personally tested and reviewed.
First Impressions and Unboxing
My first impression was: “boy, this thing is tiny.”
The box it arrived in isn’t much bigger than the palm of my hand. So, let’s open ‘er up and see what we’ve got…
Front and back view of the retail box
The SensorPush HT1 sensor removed from the retail box
The SensorPush HT1 sensor, instruction booklet, and adhesive strip
The front and back of the SensorPush HT1 sensor
First: Setting up the SensorPush HT1 and Free iPhone App
There are quick-start pictorial instructions in the sensor manual that show you how to pair the SensorPush HT1 sensor with the free smartphone app:
The instructions are simple enough that pictures are sufficient
I followed the instructions, and had zero issues. First, I downloaded the app from the Apple app store.
Downloading the free SensorPush iPhone app
Once downloaded, I simply followed the prompts and the sensor paired with my iPhone 12 immediately. No issues.
Adding my sensor to the app
Pairing the sensor via bluetooth
After pairing, I decided to name this sensor “Music room” since I’d be using it to measure the overall humidity in the room where I keep 4 guitars and 1 bass out on a rack.
Naming the sensor
However before I call it good, I want to first test the sensor’s humidity accuracy (I’m not as concerned about temperature). Most hygrometers need a bit of minor calibration right out of the box, so I’ll spend the next 2-3 days doing that before I officially put this thing to work.
Next: Checking Accuracy & Calibrating
With any new hygrometer, the first thing you should do is check it for accuracy and calibrate if necessary. To check and calibrate the SensorPush for humidity accuracy, I used my favorite system: the Boveda 75% One-Step Calibration Kit.
You can also do a basic “salt test” too, if you’re familiar with that technique. A bit of salt and water is a lot cheaper, but I prefer the precision of the Boveda kit.
Sealing the sensor in with the 75% humidity packet
After leaving the sensor in the Boveda bag for about 48 hours, the sensor was reading 73.7% humidity.
This meant that it was 1.3% lower than the 75% it should’ve been showing. Not bad, and well within what we’d consider normal for a hygrometer right out-of-the-box (more on this below).
So, I simply calibrated the sensor up +1.3%… to 75%. This meant the sensor was now perfectly calibrated and accurate, and ready to be put into service.
Reading 73.7% after 48 hours
Bumping up 1.3% so it’s perfectly calibrated
Quick Note About New Hygrometer Inaccuracy
It’s normal for hygrometers to be “off” by up to +/- 5% right out of the box.
Sure, it’s great if they’re bang-on, but that’s the exception rather than the rule. This is why it’s important that whatever hygrometer you choose has a calibration function (not all of them do), and that you test it as soon as you receive it.
If your hygrometer is more than +/- 5% off, it’s defective and should be exchanged. Most hygrometers won’t even calibrate beyond +/- 5% anyway, so you have no choice but to exchange it.
The SensorPush In-Use
After testing and calibrating my SensorPush sensor, it was time to essentially set-it-and-forget-it. Really, that’s all there is to it after you’ve done all the preliminary stuff I outlined above.
So, I chose a spot on my studio desk that was somewhat close to my guitar rack (since that’s the area I’m most concerned about keeping stable).
The great thing about the SensorPush is that I can now check humidity from anywhere in my house–and even outside my house… up to a limit.
Now, rather than having to go into my music room, I can just whip out my iPhone (something I always have with me) where ever I’m at.
Here are a few screenshots from a recent reading:
By the time I took these screenshots, I’d bought a 2nd monitor and placed it inside my acoustic guitar case
I love that I no longer have to physically walk down to the music room to check humidity, or randomly discover that my room humidifier ran out of water and left my guitars bone-dry.
I can rely on the SensorPush app to alert me when humidity drops too low… which usually means my room humidifier ran out of water and needs a refill.
A humidity alert from the SensorPush
A temperature alert from the SensorPush
Ratings, In-Depth
Build Quality 
The SensorPush HT1 is just a tiny circuit board + battery inside an outer plastic housing. The plastic seems sufficiently durable that I’d be confident dropping it onto a hard surface from a height of 4-5 feet without it being damaged. I didn’t want to test this theory with my only sensor–since I bought this one for actual use. The HT1 sensor is not water resistant, but you shouldn’t need that for basic indoor guitar monitoring.
If you need a sensor that is more resistant to rain or incidental splashes, check out one of SensorPush’s other sensors: the SensorPush HT.w or SensorPush HT.xw.
Ease of Use
I really have nothing bad to say here. I simply downloaded the free iPhone app, launched it, and then followed the on-screen instructions. I placed the HT1 sensor next to my phone and the two instantly paired via Bluetooth. About a minute later, I started getting my first temperature and humidity readings. I then put the sensor into a calibration bag for about 48 hours, and when I saw that it was off by a hair, I simply calibrated it. Navigating the iPhone app was a piece of cake–for calibration as well as everything else like naming the sensor, setting alerts, etc.
Day-to-day usage has been easy and straightforward, and I’ve been using it for over a month now. I simply launch the iPhone app any time I want to check humidity or temperature, or I get alerts if either of those readings fall outside the limits I’ve set. Pretty sweet.
Accuracy
As I mentioned in the review, once I calibrated the humidity reading, the hygrometer was spot-on (as far as I know). In about a year I’ll check accuracy again with the Boveda calibration kit, which is something you should do with any hygrometer anyway. Sure, the initial accuracy was off by 1.3%, but that’s well within what’s considered normal and exactly why good hygrometers include a calibration function to compensate. It’s important to note that I didn’t test temperature accuracy–not formally, anyway. I’m not as concerned about temperature, and the SensorPush’s temperature reading was basically the same as my home thermostat’s reading, and that was good enough for me to assume it’s accurate.
Features
The HT1 sensor itself really doesn’t have any “features” per se; it’s basically just a sensor. The features all happen via the free iPhone and Android app. With the app, you can monitor an unlimited number of SensorPush sensors, and give each a different name. You can do the basics of just viewing temperature and humidity, or you can view a 20-day history of that data. You can also export your data as a CSV if needed. Lastly, you can set up custom alerts if you’d like, so you get a notification via email and/or a phone alert (your choice) when the humidity or temperature falls outside whatever limits you’ve set.
Price
At nearly $50, the SensorPush HT1 is on the higher-end compared to similar sensors, but I feel that the value-for-the-money is there. There are standard LED-display hygrometers for as cheap as $10 on Amazon, and other wireless bluetooth sensors for $15 – $30. However, cheaper isn’t always better, as evidenced by some of the negative comments on those cheaper products. So far I’ve been very happy with my SensorPush sensor and feel it’s $50 well-spent. In fact, while writing this review I bought a 2nd sensor to go inside my acoustic guitar case, and plan to buy a 3rd sensor soon.
Recap: What I Liked
- The SensorPush HT1 is tiny, so it’ll work sitting on a shelf, or will fit inside any guitar case easily.
- Setup was really easy. The free app was easy and intuitive to navigate, set up custom alerts, etc.
- I can now monitor my music room’s humidity from anywhere in my house (and outside, if I don’t venture too far away), using a device I always have on me: my iPhone.
- Ability to set up humidity and temperature alerts. Now I’m alerted immediately when the room’s humidity drops dangerously low–which means my room humidifier has run out of water.
Recap: What I Didn’t Like
Nothing, really. Product review etiquette dictates that you should always list at least one “con,” but I genuinely couldn’t find fault here.
The Final Verdict
I’m sold. In fact, during the course of writing this review I ordered another SensorPush HT1 to go inside my acoustic guitar case, and will order a 3rd for another case queen of mine.
The biggest adjustment for me has been breaking the old habit of going into my music room or opening a guitar case to check humidity. I forget that I can now just tap my iPhone and check from the comfort of the couch.
Does the gateway automatically reconnect to wifi after a power outage? Thanks!
HI Arun. I’m not sure, since I don’t use the gateway (I only use the individual hygrometers without the gateway), so maybe someone else who sees this can chime in.