I built the kit and it seems to work but the meter shows incorrect voltage -1.1 for ch1 and 1.0 for ch2 (aprox). ?If I test a known 5v source the meter will change to reflect the 5V so it seems the baseline for 0 is off?
I've tested voltage also pin 8 of the IC and all are in spec.
Any ideas?
Thanks!

Nevermind, didn't realize it need to be calibrated all is good now.