• Professional battery hydrometer (Auto Tester).
• Sturdy design with straight glass cylinder/tube.
• Hand held tester reads specific gravity of battery acid.
• Accurate easy to read battery acid testing.
• Red, White & Green battery charge level Indicators.
• Specific gravity of electrolyte can be checked immediately after charging battery.
This Auto Tester battery Tester has been manufactured to provide accurate test readings.
A test cannot be made properly unless each battery cell has enough fluid to allow the float to rise freely. You will not get an accurate reading if water has been just recently added to the cells.