A year ago I bought ARSTN OLED M130B - a cool device. But I had to order another one. I chose faster. Yes, two batteries are included. But the contacts came out into the battery compartment (next to the springs). I didn’t notice, I made an effort - the cover closing the back and the contact jumped out. I had to solder the contacts. It works, but compared to the previous one, it takes a long time. Numbers are bad. Conclusion. Don't go cheap :)
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