The STANLEY SST66119 Spark Testing Screwdriver is a compact electrical test pen designed for checking live electrical circuits within its 100–500V AC test range. It features a transparent insulated handle that allows visibility of the internal indicator and a durable metal testing blade. Its pocket-size design and clip make it convenient for electricians, maintenance personnel, technicians, and general electrical inspection work.

The STANLEY ST66120 Spark Detecting Screwdriver is the longer version of the ST66119, designed for electrical testing within a 100–500V AC range. It combines a screwdriver-style testing blade with an insulated transparent handle and built-in electrical indicator. Its 100 mm / 4-inch blade provides greater reach when testing electrical terminals and components.