Buffer solution for pH 7 and 9 for all pH measuring instruments.

Cal Check for nitrates, 0,0 and 50 ppm Using the device - exclusive HANNA - CAL CHECK validation of instrument performance is quick and easy to achieve using standard solutions NIST attached (included). If the readings are outside the limits specified in the certificate of calibration, the user must perform a calibration of the instrument.

Alkalinity Calibration Checking Set for hi 755

mV Electrode made of glass, BNC, cable length 2 m (78.7 in.), suitable to replace Redox Controller 7075.000, 7000.000 or commercially available mV measuring instruments.

pH controller (7070/2) This handy inexpensive pocket measuring instrument is supplied with a universal wall mount and electrode holder along with a long-life glass electrode, buffer solution and 9 V battery. The Auto Power Off function ensures a long life of the battery.