Sometimes called a Magnetic Brush or Magic wand.
Magnetic brush with a stronger magnet and a larger head. The shaft, for withdrawing the magnet, has a knob on the end and is spring-loaded. This keeps the magnet in place when developing prints above shoulder level and keeps the powder from falling off.
1000LM CREE T6 XML LED Tactical Torch Zoomable Waterproof Bright Flashlight With Two 18650 Rechargeable Batteries & Charger