Electro-Chemical Devices (ECD) L20 C - Manual (Page 4)

voltage is correct. If the wrong AC adaptor is supplied, notify your
ECD representative immediately.
Installing the Batteries
To insert the batteries into the meter, follow the procedure outlined
below.
1.Use two hands to flip the two buckles and battery cover to expose
the battery compartment. (Figure 1)
2.Note the polarity and insert the six AAA batteries into the battery
compartment correctly.
3.Replace the battery cover.
Figure 1
4