ACS 712 sensor error in measuring current

Hi, I'm trying to use the ACS 712 sensors to measure current.
...

I got the 30 amp version to make the current testing rig future proof.
Most of what I'm currently measuring though will be under 1 amp.

These are hall-effect sensors - they are very noisy and imprecise and only for high
current. But they are isolated from the load which can be handy.

If you are measuring under 1A these are definitely not the sensors to use,
you want a shunt-resistor based sensor for that.