Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
Compact meter, measures up to 100K, connect wire from what you wish to meter to input of combinator (top most) to use.
1 Red, < 20k
2 Red <30k
2 yellow > 30k
3 yellow > 40k
3 green >50k
4 green > 60k
5 green > 70k
5green + 1 purple = 90k and above
If you wish to set custom values for metering, change values on lights.