The LED is very easy to see. I couldn't read the instructions in Chinese, but the operability was good.
Although I bought direct SDS3 from SINO about ten years ago, seven-segment display broke down after a while, and I was in trouble. In the display by SINO of those days, seven-segment display has broken in others, and it was a weak point. Since I imagined that SDS3 was discovered by aliexpress and I was compatible, I placed an order for SDS3. SDS3 bought this time is compatible with SDS3 of ten years ago, and it succeeded in replacement. Thank you.