9 pH meters; pH meters with automatic temperature compensation (ATC); scientific measuring instruments, namely, total dissolved solids (TDS) meters; scientific measuring instruments, namely, conductivity meters; scientific measuring instruments, namely, electrical conductivity (EC) meters; thermometers, not for medical purposes; scientific measuring instruments, namely, oxidation-reduction potential (ORP) meters; scientific measuring instruments, namely, nutrient meters, not for medical purposes; dissolved oxygen meters, not for medical purposes; scientific measuring instruments, namely, light meters; scientific measuring instruments, namely, sodium chloride (NaCl) meters; scientific measuring instruments, namely, chlorine meters; scientific measuring instruments, namely, turbidity meters; electrical controllers for monitoring and adjusting pH levels; kits comprised of electrical controllers for monitoring and adjusting pH levels, power supplies, pH probes, oxidation-reduction potential (ORP) probes, dosing pumps, non-metal flexible tubing, and buffer ยท solutions; refractometers; refractometers for analyzing sugar; refractometers for analyzing glucose; refractometers for analyzing fructose; refractometers for analyzing invert sugar; refractometers for analyzing ethylene glycol; refractometers for analyzing sodium chloride (NaCl); refractometers for analyzing seawater; refractometers for analyzing wine and grape juice must; refractometers for analyzing potential alcohol; refractometers for analyzing Brix; colorimeters; colorimeters for analyzing chlorine; colorimeters for analyzing phosphate; colorimeters for analyzing iodine; colorimeters for analyzing iron; photometers; photometers for analyzing ammonia; photometers for analyzing iron; photometers for analyzing pH; photometers for analyzing phosphate; photometers for analyzing chlorides; photometers for analyzing peroxide in olive oil; photometers for analyzing chlorine; photometers for analyzing turbidity; scientific apparatus, namely, titrators; scientific apparatus, namely, titrators for analyzing sulfur; scientific apparatus, namely, titrators for analyzing acidity in wine; magnetic stirring bars for laboratory use; beakers; laboratory pipettes; laboratory consumables, namely, pipette tips; electrodes; holders for electrodes; probes for scientific purposes; membranes for probes for scientific purposes; measuring cuvettes for laboratory use; caps and stoppers for measuring cuvettes for laboratory use; power adapters