Feature:1.Material:glass tube with rubber

2.Size:7"

3.Instrucion of use

 First to install the tester carefully,let the big head glass tube which has sensing material in stay bellow,then fit the rubber tail at the bottom.Hold the tester vertically,put the rubber tail into the testing liquid,squeeze the ball and  inhale enough liquid to enable the inner glass tube move freely.The mark on the inner glass tube which is equivalence with the surface of liquid indicate the condition:red:1100-1205   dischargedwhite:1205-1260  low chargegreen:1260-1300  fully charged

4.Note:It will not accurately test  if water has been added to the cell.It must have enough battery cell to enable the inner glass tube to float freely.Wash the battery hydrometer with clean water after use,it can be reused.

5.OEM supply