Draper Battery Hydrometer

Specific gravity is a measure of the density of the battery electrolyte compared to water. It indicates the battery's state of charge; higher specific gravity means a higher charge.

Test your battery every 2-3 months or more frequently if you suspect issues or if the battery is used heavily.

The red zone (1.100 - 1.205) indicates that the battery is discharged and requires charging.

No, this hydrometer is designed specifically for lead-acid batteries. Using it on other types of batteries may result in inaccurate readings or damage to the device.

Calibration is carried out at 20°C. Make sure you use the hydrometer at this temperature for accurate results. There is no manual calibration.

Immediately rinse the hydrometer thoroughly with clean water. If acid comes into contact with your skin or eyes, rinse immediately with water and seek medical attention.

Dispose of battery acid responsibly, following local regulations for hazardous waste.

Yes, rinse the hydrometer thoroughly with clean water after each use.

Ensure the hydrometer is clean, calibrated, and used at the correct temperature (20°C). Check for any damage to the glass tube.

Check the bulb and spout for any blockages. Ensure the tube is inserted correctly into the battery cell.

Double-check the hydrometer reading against the color-coded zones. Ensure the battery is not sulfated or damaged, as this can affect readings.