The Oakton Conductivity/TDS calibration solutions are cross checked using different test methods, premixed, and ready to use. Each bottle is labeled with the name and CAS number for all ingredients to conform with “Right-to-Know†requirements, and includes an MSDS. Solutions come in one pint bottles. Dimensions: 7.75"H x 2.25" diameter. Ship wt. 1.1 lbs. Oakton #: WD-00653-18