User manual

Getting Started: Installation
WFM 90 & WFM 91 User Manual
1–13
Battery Installation and Removal
Replacing Alkaline Batteries. The WFM 90 and WFM 91 battery
compartment is located under the back panel of the instrument. The
battery compartment is opened by turning the screw head at the top
of the panel 1/4 turn.
A label on the bottom of the battery compartment illustrates the
correct battery polarity. The polarity of the alkaline batteries must be
correct for the instrument to operate. Figure 1–2 shows the correct
alkaline battery polarity.
NOTE. Replacement of Alkaline Batteries
Always replace all of the alkaline batteries at the same time when
replacing discharged batteries.
Figure 1–2: Installed polarity of alkaline batteries