Amprobe BAT-500 Battery-Impedance-Tester - Manual (Page 7)

BAT-500
Battery Impedance Tester
LEDS Display
PASS
(Green LED)
To indicate the tested battery complies with the high limit
of comparator.
WARNING
(Yellow LED)
To indicate that the tested battery is going to deteriorate.
FAIL
(Red LED)
To indicate that the tested battery has deteriorated.
These indications will appear when the High and Low comparator limits for
internal impedance and the comparator threshold value for voltage are all set.