Professional Battery Hydrometer - For Flooded Lead Acid Batteries &ndash; Automotive, Marine, Deep Cycle, Golf Cart, Forklift Professional grade battery tester. Tests the battery in seconds with color-coded float for easy reading. Calibrated individually by a skilled technician and quality checked twice. Flexible tip offers easy access to the battery cells while the battery is still in the vehicle. Compact hand held tester reads specific gravity of battery acid between 1.100  1.300.