How to change battery?

1. Replace the battery when the icon  appears in the lower right corner of the LCD display.
2. Pull the battery cover off as shown in figure 3.
3. Gently pull out plastic circuit board with the battery compartment for approximately 1 cm (see figure 4).
4. Use pointed object such as a pen to remove old battery. Discard battery lawfully.
5. Replace with new 1.5V DC button type LR41 or SR41, UCC392, or equivalent. Be sure battery is installed with polarity facing up. (see figure 5)
6. Slide battery chamber back into place and attach cover.