Q:

Poor WiFi signal with Raspeberry Zero W

I have recently bought Rasberry Zero W. Since I wanted to get original top quality item I bought it at PiHut.
Nevertheless, I still have problems with the unit; as it has incredibly poor WiFi signal. When about 2 m from the AP (one wall in between), signal power is only -72dBm to -82dBm depending on the unit orientation, as checked by iwconfig command.
I have tried two different SDcards, two different power supplies, without significant change. I also put my Raspberry Pi 3 on the same spot, signal power is -56dBm (I haven't tried different orientations, just for comparison).  Finally using Wifi Analyzer for Android on my smartphone (Galaxy S10E), signal power is around -45dBm.
Is such small signal normal for Raspberry Zero W? Should I perhaps asked for a replacement?

A:

I bought another Raspberry Pi Zero W. 
With the same power supply, the same SD card as the first Raspberry Pi Zero W and on the same spot, signal is -44dBm to -49dBm. This is better than Raspberry Pi 3 and comparable to my smartphone.
The first Raspberry Pi Zero W is obviously faulty and I will send it back.

