Hanna calibration fluid and maintenance kit

Need to know

• Universal for all brands of electrodes
• Maintenance in a matter of minutes
• 1 x pH 4 calibration fluid (20ml)
• 1 x pH 7 calibration fluid (20ml)
• 1 x redox test fluid (20ml)
• 1 x cleaning fluid (20ml)
• 1 x storage liquid (20ml)