Sper Scientific 850055 pH Meter - Advanced - Manual (Page 6)

6
POWER SUPPLY
The meter is powered by 4 “AAA” type batteries or a 9 Volt
external adapter. Insert batteries into the battery
compartment observing correct polarity and secure.
Tripod mountable
Observe correct polarity
When the battery is low the “ ” icon appears on the LCD
display; replace the batteries.