*squeeze bulb and draw up enough liquid until float moves freely but do not touch rubber stopper at top barrel.
*insert rubber tip in cell of battery.
*hold instrument in vertical position.
*the mark on the battery tester which is in line with the surface of liquid indicates condition of battery thus:
RED – 1.100~1.205 battery cell is in discharged.
WHITE – 1.205~1.260 battery cell needs attention.
GREEN – 1.260~1.300 battery cell is OK.