Sensirion hygrometer SHT4x test report
Sensirion Hygrometer SHT4x: I tested seven sensors during three weeks in seven cabinet humidors. References: Bodveda Butler, built-in humidor sensor and synthetic hair hygrometer. The Sensirion works via Bluetooth and is the company's newest model. It is said to display RLF accurately to +/- 1%. How the comparison test turned out and whether the purchase of this sensor is worth it, you can read in this article.
The set up
Note: The Boveda sensors always showed the same values. After the test phase, I removed all of them from the humidors to check them. The result: The app always shows the same values as in the humidors.The Boveda Butler is no longer available for purchase. In the meantime there have been several iOs updates without the app getting an update. Reading tip: Cigars.Zone has reported about it.
First I bought a Sensirion sensor SHT4x to test at zigarren-online.ch. After a few hours, I found the measurement results so interesting that I bought 6 more Sensirion hygrometers SHT4x. I decided to carry out a test.
The set-up:
- 7 Cabinet humidors
- In any cabinet humidor:
- 1 x Boveda Butler (I could have saved myself, see note above)
- 1 x Synthetic hair hygrometer from the hardware store
- 1 x Sensirion SHT4x
- 1 x built-in sensor
- Test period: 20.11.21 - 11.12.21, between 09.00 and 10.00 a.m.
- The lounge was ventilated for 10 minutes between 07:00 and 08:00 on the days of the fair (balcony door was open)
- The cabinets were opened from time to time during the day after measuring to remove cigars or put them inside. The door was open for about 30 seconds. Opened was also not at all for days.
Super simple Sensirion hygrometer detection in the app
The app recognizes the sensors super easily. That's a really great solution!
The measurement results Sensirion hygrometer
There were 15 control days I was in the lounge during this time. You are welcome to download the PDF with the detailed measurements:
The Sensirion App
On the back of the sensor is a QR code that leads you to download the app for iOs and Android. Below in the resources on the topic I have provided the direct links to the two operating systems.
The app is simple and intuitive to use. You can pair multiple sensors. It works via Bluetooth. To quote "Big Bang Theory," "Everything is better with Bluetooth."
Conclusion
The Sensirion hygrometer is a great tool that I'm happy to recommend to you. If you look at the PDF with the measurements, you can see how it measures and displays humidity and temperature all the time. It's amazingly inexpensive: only CHF 39.00. I haven't seen this latest model from Sensirion in any other store, status as of December 2021, except at zigarren-online.ch.
For the quick readers again for safety thisNote: The Boveda sensors always showed the same values. After the test phase, I removed all of them from the humidors to check them. The result: The app always shows the same values as in the humidors.The Boveda Butler is no longer available for purchase. In the meantime there have been several iOs updates without the app getting an update. Reading tip: Cigars.Zone has reported about it.
The synthetic hair hygrometer shows changes now and then, as well as the internal sensor of the cabinet humidors.
In the PDF you will see now and then "Ventilated to ...". This means that I wanted to have a certain humidity value. If the humidity was too high, I left the door open a crack. This worked very well. Especially the Cuban cigars like it when the humidity is around 69% (otherwise the draw resistance may be too strong). I have two cabinets with only Cuba cigars. In two cabinets, the Cuba percentage is lower.
"Calibrated" means: I set the internal hygrometers as well as the synthetic hair hygrometers to the value of the Sensirion. Worked reasonably well. I had to repeat the calibration several times.
In the app, three areas are color coded: Yellow / Green / Blue. I have not yet seen how I can deposit my desired measuring range (68% - 72%) Green. I suspect that it is not possible to do this. Is also not necessary, would be purely cosmetic.
Further down at Resources on the topic you will find various links, including iOs and Android download of the app. Thank you for reading my review.
Direct comparison. I have now packed 2 sht4.x and 2 sht3.x with a 72 Boveda in a l&l box. Wait 24 h
Uh-oh. Boveda will swell up and implode ?? Good test, am curious about the result.
Test after 48h with 72 Boveda
Sensor 1 SHT3.X 74.54 %
Sensor 2 SHT3.X 74,37%
Sensor 3 SHT4.X 70.06%
Sensor 4 SHT4.X 69,99%
I will repeat the test again under better conditions. I tested in the living room. Since the sensors were exposed to different temperatures. Will soon pack everything in the basement, there the temperatures should be more constant.
Tiptop. That says it all. The new ones are better ??☃️?❄️?
I correct: So far it says that the old ones have a drift;)
Great report. I have been using these sensors for a very long time and am very satisfied. Do not use the Bluetooth function so that the battery lasts longer. What I find a pity that you can not calibrate this sensor and that you have a drift every year. I always equalize it with bovedas and label it with the drift value. (... +4%)
Thank you. How long have you been using the SHT4x? As far as I know, this is a new model? But I can also be mistaken. https://www.sensirion.com/de/umweltsensoren/feuchtesensoren/smartgadget-sht4x/
Hello everyone, yes the SHT4x has only been on the market for a short time. Before that, the SHT3x was in use everywhere. ?
I use the SHT3.1 What is the difference with the new model?
Even more accurate, even more economical with power consumption. This will probably help you, then you can possibly compare with the old junk you still use ? ... Fun ... ? Here: https://www.sensirion.com/de/umweltsensoren/feuchtesensoren/smartgadget-sht4x/
Thanks, then I'll probably convert... But calibrate you still can not???
No. You don't have to.
Do these have no drift??? Only time will tell...
Stands unfortunately nix there, stupid, I know. I'll copy an answer from INSTA, which zigarren-online.ch has given to such a question: "Is no longer specified on the 4x version on the product itself. With the 31s was the but at 0.03% per year, accordingly I do not think that this could somehow have a worse impact on the 4x.... "
The drift does occur and is significantly higher than the 0.03 % on the one with me is now a glue on it with -2.5% (about 1.5 years old)
Holy cow. Of course, that's a lot.
Yes a neat drift. But good that we have talked about it, I have to match the L&L cans. Surely also exciting
I have now ordered 2 pcs.