Industrial Design: A salesman's "pass-through" diagnostic tool with a male Edison screw base and a female lamp socket. Precision Scale: Internal analog display face graduated from 0 to 125 Watts. Case: The original leather housing remains flexible and intact with a natural aged patina. The original metal snaps are present and functional.
Indicator Unit: The metal body is in very clean condition with clearly legible stamped information and a bright finish. The internal scale is crisp.
Glass: The front protective glass is missing.
