These Kestrel replacement battery covers are for the CR2032 battery on the Kestrel meter.  We've found a nickel to work well when replacing the cover.

For the older version of the Kestrel 1000 and 3000 models, where there are only 2 buttons on the front (vs. 3 now), please choose the 3146 legacy battery door from the drop down.  It fits both of those.