You've got some choice here. You can use two 1.5V A76 or 357 batteries, or one 3V 2L76 battery.
The best choice is silver oxide because it has a flat discharge curve until exhausted. Alkaline and lithium alternatives have declining voltages before they are dead, so you can get inaccurate readings.
Some common manufacturer designations for the correct size are: 76, S76, 357, SR44. The FE takes two of these. There are other equivalents, just be sure the packaging says silver-oxide.
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