For optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges.
The 342ppm Calibration Solution is designed for use with pure drinking water. The 1000ppm Calibration Solution is designed for use with beverages, aquariums and pools.

Specifications:

• NaCl calibration solution
• Available in 342 ppm or 1000 ppm
• Sealed with a coated foam liner
• 3 oz. bottles (88.7 mL)
• Good for 5-10 calibrations
• Shelf life of 6-9 months

Solution Conversions:

342 NaCl = 362 as KCl 478 as "442" 700 µS ----------------------------------------------------------------- 1000 NaCl = 1060 as KCl 1450 as "442" 2000 µS