JBL Colour charts for water tests

Description

JBL Coloure charts for all JBL water tests: Everybody who often tests the aquarium water needs new coloure charts from time to time. Now a new coloure charts folder for all JBL tests is available

1. water reistant coloure charts as folder
2. complete for all JBL water tests (also pond)
3. with how to do pictures