There are binoculars in Tianjin that need good quality.

1, it's probably a little hard to find. You can ask on the spot. Also, such as photographic equipment, you should look carefully.

You can also visit the night market. Some people sell lighters, and some of their booths really have this thing. I've seen it.

2. Xinhua Bookstore sometimes has it, but the price is too high, so it is not recommended.

Note that the market is very chaotic now, and there are many fake and shoddy products. If you have time, you can systematically look at some basic knowledge of quality optics, which is more comprehensive. For example, military, night vision, Russia introduces some common scams that need to be avoided. It should help.