What GH tells you
GH is a measure related to dissolved calcium and magnesium, minerals that matter to shrimp. It does not identify every ion or trace substance in the aquarium.
Use the kit instructions carefully and note the units. A drop-count test may show a broad range rather than a precise laboratory measurement.
Compare before adjusting
Test both tank and replacement water. If GH is outside your keeper reference, review source water and any remineralizer before adding more minerals.
Do not correct the entire aquarium suddenly. Adjust prepared water gradually and observe the colony, especially around molts.
For your own tank
Record the test kit, unit, and sample source so future readings can be compared fairly. If you adjust minerals, change the prepared water first and retest it. Never pour concentrated salts onto shrimp or infer GH from a conductivity meter.
Use these as general hobby references. Test your aquarium and confirm product guidance before making changes.