I bought HT-301 on amazon.uk
https://amzn.to/2Jcoqns a month ago and use it couple weeks.
I have not any thermal camera before, but I saw many reviews and tests of seek thermal and others thermal cameras.
I think, that hardware of ht-301 is good enough. Photos and video are detailed and not noisy.
And 13mm lens plays here the most important role.
There are many other thermal cameras with QVGA resolution and small lens, but quality of their images are worse.
HT-301 video is smooth with 25Hz. But sometimes it is only 23-24Hz, may be it depends on phone. Video is only without sound.
23Hz
https://youtu.be/MKHlP86JSk824Hz
https://youtu.be/dOjAVNVGGC424Hz
https://youtu.be/gUCKiVa3baM25Hz with all types of pallets
https://youtu.be/F9461Vfi_hAUnfortunately you can not make long video with android App "Hti image". Video will be splitted into 3 minutes parts (each part 200 megabyte).
And there is a small problem with shutter. It makes automatically recalibration every 2-3 minutes and sometimes this causes 1 second freeze moments in video.
But if you make manual recalibration before you start video, you can get 1-2 minutes without freeze moments.
I hope it will be fixed with software update.
Freeze moment
https://youtu.be/r1U0-8-PtOYResolution of photos and video is 1420x1080. There is no possibility to get RAW Image (384x288). There is only 1420x1080 increased resolution with "Hti Xintai" logo. Logo sometimes blinking on video. I think, some options of temperature measurement cause it.
All pictures and video will be storaged in internal phone memory. There is no possibility to storage on SD card.
So, internal memory of your phone must have enough free space. I have now only 2Gb free space and this is a little problem for me.
Car
Building 1
Building 2
Building 3
Building 4 (with phone camera)
The door to the street
Freezer with hot water
Accuracy of temperature measurement is correct, but depends on setting. You need to choose right distance in setting, otherwise accuracy get worse.
Ice water
Boiled water
Camera can measure temperature up to 600-680°C and it depends on distance setting too.
To measure high temperature you need to change the temperature range, but before that you need to choose one of temperature measurement, otherwise software will be crashed.
HT-301 Gas Soldering Iron (over 600°C )
Minimum focus distance is about 15cm. It would be desirable a bit smaller for very small smd or electric parts, but for other things this focus distance is O.K.
I tried to screw out lens to reduce focus distance, but it seems that lens has a locking inside. I plan to buy ZnSe lens, but I don't know which diameter and focus is better.
If somebody has any idea, please write me.
Focus
TP4056
DC-DC XL4016 1.
DC-DC XL4016 2.
Fritzbox 3390
I think that "Hti Image" software needs further development, but hardware is really good.