hyrgometer issues

[Xiola]

Hello. I am new here and needs some help.

I have one hyrgometer that calibrated on the mark. It says the humidity is 95-97%.

I have a second hyrgometer that after calibration was 4% over what it should be. Now it reads 80, with calibration that is 76%

This is not a large tank. It is 30 gallons and they are in the same spot in the tank.

Which one do I believe? There is humidity in the tank but 95+%, I just doesn't seem right. How can these 2 calibrated machines read so different?

Please help. Thank you.