Ball indicators from L3 Electrodynamics are divided into two categories.

The BHG (Single Coil) family and BHGD (Dual Coil) family are miniature BITE Indicators that are qualified to MIL-PRF-83287/3. These indicators are latching which assures fast positive response to a fault signal. The display ball changes colour only when the indicator coil is pulsed by a BITE (Built-In Test Equipment) system. The magnetic indicators have no bearings, springs or filaments to wear out and offer excellent visibility in high ambient light.

The BIS series are miniature BITE indicators that provide visual indication of the status of any circuit parameter being monitored. This series is a self-restoring design that automatically returns to a neutral state when power is removed.