Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for science and technology]
8. scientific instruments
9. chemistry equipment
10. chemical testing devices

Anotations

Scope note:

Devices for monitoring the equilibrium of water, and that can supply an index useful in controlling anti-corrosion treatment. This is in respect to its degree of CaCO3 saturation. If a water has a negative Langelier Saturation Index (LSI) value, it is under-saturated with respect to calcium carbonate and is potentially corrosive.