Concorde Hydrometer
Glass shaft with rubber bulb to measure electrolyte within the cells of a flooded lead acid aircraft battery. Made in the USA. Made specifically for aircraft battery testing. Aircraft batteries use much less electrolyte in the battery cells compared to automotive batteries. The FR-1 works on very low quantities of electrolyte drawn off, unlike automotive hydrometers that require a considerable amount of liquid drawn off for testing.
Earth Solar Group
You've got to mount those panels on something! And it's always better to leave the engineering to the engineers. We carry racks by 