Gill FR-1 Aircraft Battery Hydrometer

Make SkyGeek.com your first stop for all your aviation-related needs, including battery-related items like this hydrometer. You can use this convenient tool to check the electrolyte level of your aviation battery periodically-this way you know when you need to order a few more quarts of electrolyte fluid (battery acid) from your friends at SkyGeek.com.

This Gill FR-1 Battery Hydrometer will tell you the correct ratio of liquid to the density of water. Pick up a few today and keep them handy in your pocket or aircraft hangar.