User Guide

These meters are powered by a 9V battery that is located on the rear

of the instrument.

When the battery level is so low that it may cause unreliable

measurements, the meter turns off.

It is recommended to replace the battery immediately.

Battery replacement must only take place in a nonhazardous area

using a 9V alkaline battery.

Unscrew the three screws

on the rear of the meter,

remove the battery com-

partment cover and

replace the 9V battery

with a new one while

paying attention to its

polarity.

Make sure the battery

contacts are tight and

secure before replacing

the cover.

BATTERY REPLACEMENT

4. if the red LED lights up again, calibration is needed (see

"pH Calibration" section).

Note: If it is not possible to calibrate, the probe has to be replaced

with a new one.

Note: For field applications, it is always recommended to keep a

spare probe handy. When anomalies are not resolved with

simple maintenance, change the probe and recalibrate the

meter.