Key ring with test pencil

The invention provides a key ring with a test pencil. The body of the key ring is provided with a voltage display screen, and the tail end is provided with a telescopic metal bar. When having some problems like sudden power interruption in daily life, a user can take down the key ring carried with h...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	WANG JIADAN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE HABERDASHERY HUMAN NECESSITIES JEWELLERY MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING
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