Hydrometer for measuring electrolyte density Forsage F-9G4005 — manual density gauge for battery acid

Hydrometer Forsage F-9G4005 is a manual density gauge designed to measure the specific gravity of electrolyte in lead-acid batteries. The handheld instrument gives a direct reading of electrolyte density to help determine state of charge and detect issues such as sulfation, stratification, or water dilution. Its compact construction and simple operation make it appropriate for workshop technicians and field service use when testing individual battery cells during maintenance or troubleshooting.

Advantages

This hydrometer offers straightforward manual measurement without need for power, enabling quick assessment of each cell's specific gravity. The clear float-scale display allows direct reading of electrolyte density and comparison between cells. Lightweight and portable, the device is suitable for use in confined battery compartments and on-site service visits. Materials in contact with electrolyte are selected for chemical resistance to dilute sulfuric acid, promoting durability with normal workshop use.

Suitable for

• Measuring specific gravity of electrolyte in lead-acid vehicle batteries
• Battery maintenance and state-of-charge checks in workshops and garages
• Diagnosing individual cell problems during battery service and repair
• Field testing and periodic inspection of stationary lead-acid battery banks

Key specifications

• Manual hydrometer design with float and scale for direct specific gravity reading
• Handheld, compact form factor for portable use
• Materials resistant to dilute sulfuric acid for compatibility with battery electrolyte
• Suitable for use with lead-acid battery cells (service and testing)

How to use

Wear appropriate personal protective equipment (gloves and eye protection) before handling battery electrolyte. Insert the hydrometer tube into the battery cell and draw electrolyte until the float moves freely inside the chamber. Read the specific gravity value indicated by the float against the scale at the electrolyte surface level. Compare readings between cells to identify discrepancies indicating partial charge, sulfation, or electrolyte stratification. After measurement, return electrolyte to the cell if instructed by battery manufacturer, rinse the hydrometer with distilled water and store in a safe place away from direct sunlight and corrosive substances.

Usage recommendations

Use the hydrometer in a well-ventilated area and when the battery is at rest (not immediately after charging or heavy discharge) to obtain representative specific gravity readings. Record measurements for each cell and perform measurements at consistent temperature conditions when possible; consult battery manufacturer guidance for temperature correction if precise values are required.