Meriam M203 Altimeter Indicated Air Speed Tester - Manual (Page 30)

battery polarity markings at the bottom of the compartment, as
shown here.
To install the four batteries: 1) Make sure polarity of battery
matches the markings in the compartment. 2) 1st place the (+)
end of the battery into the bottom of the battery slot. 3) Then push
in (-) end of the battery until it is seated in the bottom of the
battery slot. The battery compartment has stand offs molded into
the side of the compartment. When a battery is installed with the
polarity reversed, the built-in standoffs prevent the negative
battery terminal from contacting the positive terminal in the battery
compartment. The product will not power up when a battery is
installed this way. Should this happen, simply reverse the battery
to align the polarity.
With the batteries secured in the battery compartment, replace the
compartment cover. The cover has only one correct orientation.
The “ WARNING DO NOT OPEN IN EXPLOSIVE ATMOSPHERE ” statement on the
battery cover must be visible and aligned in the middle of the
product case.
Secure the cover by applying a clockwise torque of 1.6 to 1.8 in-
lbs. Do not over tighten.
To prevent internal damage to circuitry, do not
substitute screw lengths for the factory
supplied screws.
27