Total Dissolved Solids (TDS) Back Catalog number: 54182 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 93444 Citric acid [0.3% wt] Price on request 71891 1,2,3,4-Tetrahydronaphthalene Price on request 1266.8-5ML m-Xylene, neat, Solvent-neat, Unit 5mL, # of units-1, Cas.no. 108-38-3 Price on request