PT400 POOLTESTER.
Pooltester for the measurement of pH, and (free) Copper/Zinc values (differential process). Each 8 scale values, incl pestle to crush the tablets.
Intuitive
Self-explanatory is the operation of the tester. And if you are ever unsure: A look at the packaging and the intuitively understandable instructions are sufficient to eliminate the ambiguity.
Ergo mixed
The ergonomically optimized lid ensures a secure grip.