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Aircraft Battery Hydrometer

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Part# 11-01674
MFR Model# 60093


Special Tester designed for testing aircraft batteries. Requires only a small amount of fluid. Ideal for close quarters. Float calibrated from 1.100-1.300 Sp. Gr. in 5 intervals.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


School D Verified Purchase


April 20, 2023

Exactly what we needed. Arrived quickly. Thanks

April 2, 2021

Exactly as advertised

Hugh R
July 1, 2020

The instructions for using this hydrometer are contained in the GILL Battery Maintenance Manual. This document can be downloaded from the GILL battery website

Noel F
March 13, 2019

Made by Freas, Conshokocken PA, in the USA. Manuf since 1926. I have used Freas hydrometers since 1974 and Freas is the best. Comes in an unmarked wholesale box. INSRUCTIONS ( from an old retail box in the hangar) TO ASSEMBLE: Put the hydrometer in the barrel, thin end first. Then wet the plug and push it in barrel up to ring, and the instrument is ready to use. HOW TO USE Hold the instrument in a vertical position, compress the bulb and insert the nozzle as far as possible in the electrolyte gradually lesson the pressure on the bulb until the electrolyte rises in the barrel enough to float the hydrometer about 1/2 inch. The reading on the instrument must be taken when there is no compression on the bulb at the surface of the electrolyte. ( NOTE: this means you will need to extract the tip from the battery to let any remaining air out of the bulb) The specific gravity of the electrolyte is an indication of the amount of charge in a battery. When the battery indicates 1300 on the hydrometer at full charge, and after the battery has been in use and the hydrometer indicates: 1250 70% of charge 1225 50% 1200 40 % 1175 20% When 1150 the battery is exhausted and must be recharged. NOTE BY COMMENTER: An auto battery starts out at 1300 specific gravity. The best I have ever seen a Gill wet battery is about 1285 when new and fully charged. Save some of the Gill electrolyte shipped with a new battery to use as a reference test of the hydrometer. Freas test point is set at 80 F to match the Gill specs for 1285 sg. Go to Gill website to download their battery manual for variations is specific gravity from 30 F to 120 F.

June 4, 2018

Works well

Pittsburg I Verified Purchase


September 15, 2023

Useful in only the most rudimentary way. The marks are so close together that you really cant tell the difference between 100% charged and 75% charged.

Stuart F
November 9, 2018

Doesnt come with any directions...

Flight L
July 2, 2017


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is the Aircraft Battery Hydrometer made in USA or imported?

Per the distributor: Made in the USA. The FR-1 has been made by a company that specializes in scientific glass works in Pennsylvania since 1905.

Q: The rubber bulb of my hydrometer perished, do you sell the rubber bulb loose?

No, we do not sell replacement parts for this unit. We only sell the complete hydrometer.

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