Marmonix MBH-100 Lead-Acid Battery Electrolyte Tester

The Marmonix MBH-100 battery hydrometer reads lead-acid electrolyte specific gravity from 1.100 to 1.300 SG in 0.005 steps by direct float reading in an acid-resistant plastic body with a flexible PVC tube (about 290 mm long, about 120 g). It is used for routine cell checks in vehicle fleets, workshops and UPS battery rooms, alongside the battery maker’s charge and temperature guidance. Browse all Marmonix battery testers.

Marmonix MBH100 Digital Battery Electrolyte Tester

The Marmonix MBH100 is a digital battery hydrometer for checking electrolyte density and supporting lead-acid battery maintenance. A density reading can give technicians useful information about battery condition when it is taken with the correct procedure and interpreted alongside the battery maker’s guidance. Digital presentation helps make routine checks easier to record and compare across a group of batteries.

Use the MBH100 as part of a controlled inspection routine. Prepare the battery and work area safely, follow the instructions for sampling and measurement, and use appropriate protective equipment when working around electrolyte. Keep the instrument clean, avoid contamination between cells, and document the battery identifier, test date, and observed result for future comparison.

Typical application

For example, a fleet technician can use the MBH100 during scheduled service checks to compare electrolyte density across lead-acid batteries and flag units that need further investigation.

The MBH100 supports maintenance decisions but does not replace a complete battery test or charging-system assessment. Consider temperature, battery type, state of charge, and the manufacturer’s recommended procedure when reviewing readings. Rinse or care for the instrument only as directed and store it protected between uses.

See related products in our battery testers category. The category provides a starting point for selecting instruments for battery inspection and electrical maintenance.

Consistent records help teams identify trends before a battery affects service availability. Train users on safe handling and keep the work area ventilated and organized according to site requirements.

How electrolyte density checks support lead-acid battery maintenance

In a typical fleet or UPS room, several flooded lead-acid batteries share the same charger, and a weak cell can drag the string down before a full capacity test is scheduled.

Specific gravity of the electrolyte rises and falls with the state of charge of a flooded lead-acid cell: during discharge the acid concentration drops, so SG falls. IEEE Std 450 practice for flooded lead-acid batteries in stationary applications treats cell voltage and specific gravity as routine inspection measurements used with temperature correction and the manufacturer’s tables.

A common check draws a small sample into the hydrometer, reads SG on the float scale, records the cell identifier and temperature, and compares the result with the battery maker’s band. Large cell-to-cell spreads are a cue for further investigation rather than a complete diagnosis on their own.

Questions about the MBH-100 battery hydrometer

What SG range does the MBH-100 cover?

The MBH-100 measures specific gravity from 1.100 to 1.300 SG with 0.005 SG graduation, using a direct float reading in a transparent acid-resistant body.

What batteries is the MBH-100 for?

The MBH-100 is for flooded lead-acid batteries where electrolyte can be sampled safely. Follow the battery maker’s procedure for PPE, temperature correction and interpretation; it does not replace a full capacity or charging-system test.

How should I use the MBH-100 on site?

Prepare the battery and work area safely, sample as the instructions describe, avoid cross-contamination between cells, and log the battery ID, date and reading. Rinse and store the instrument as directed between uses.