ACM-6060 tester has an indicator of low battery charge. It appears in the left up corner of the LCD. However measurement may still be made for several hours after low battery indicator appears.
To replace the battery take the following steps:
Loose the screw for battery cover, take the battery cover away from the tester and remove the battery.
Replace it with 9V battery (Alkaline or heavy duty type) and reinstate the cover making sure the battery cover is secured well after the battery replacement.