Microphone User Manual

For HI8417 and HI8521

• Connect the ORP electrode to the meter and submerge the tip (4

cm / 1½") into the sample to be tested.

Note: ORP measurements are taken without temperature compensa-

tion.

• Press the pH/mV key (HI8417) or

RANGE key (HI8521) once to enter

the mV mode.

• Allow a few minutes for the reading to

stabilize.

• The display will indicate the absolute

mV value (positive or negative).

• When values are less than ±400 mV, tenths of mV are dis-

played; for values greater than ±400 mV, the decimal digit

disappears. Note that the change in scale (from 0.1mV to 1mV

resolution) is automatic. "Err2" for HI8417 or "E3" for HI8521

appears if the value exceeds ±1999 mV (out of range).

AFTER MEASUREMENTS

• Press the ON/OFF key again to switch the instru-

ment OFF.

RANGE

pHpH

mVmV

OFF