Fan speed indicator

Fatigue indicator

Faulty steam trap signal

Fence identification device

Fence wire location marker

File marking device

File marking device

Fill gate for grain bins and the like

Fill level indicator for agricultural material bin

Film cassette

Filter condition indicator

Filter differential pressure impending and bypass indicator

Filter restriction indicator

Fire escape device

Fire safety window and interior door marker

Firehose coupling exit indicator

Fireplace damper position indicator

First out fluid pressure indicator

First trip indicator for sensing devices of production control a

Fish score card