Sodium calibration solution or calibration standard set is needed to calibrate meters for extra precision.
This sodium solution set is ideal for calibrating LAQUAtwin meters in two points (150 and 2000 ppm) before measurement. 
This set was designed for intensive testing and will last for 300 calibrations (for each concentration) of LAQUAtwin meters.
We recommend calibrating your LAQUAtwin meters daily (if you measure daily) or after every 10 measurements within a single day if you are testing more intensively.
 
⚫ Set of sodium solutions (150 and 2000 ppm)
⚫ Volume: 60 ml bottle x 2 
⚫ Compatible with HORIBA LAQUAtwin Na-11 and B-722
⚫ Equivalent solutions of HORIBA calibration solution Y022H Y022L
⚫ Made in USA