Huben Manometer Variance Between Huben K1 and GK1

[Ezana4CE]

I took these photos after topping these two PCPs before topping off a SCBA tank. I filled the K1 first. It read approximately 30 mpa.Then I topped off the GK1 and it read around 25 mpa.

I found this strange so I deadheaded my SCBA tank fill line and the tank manometer read 250 bar.

Looks like the GK1 manometer is accurate and I need to get a new manometer for my K1. Anyone experience this before?

 

[Pale_Rider]

Never experienced that.

I wonder why Huben uses that slip fit pressure gauge instead of the standard gauges in the industry. It would be nice to have the option to use a WIKA or other gauges.