Manufacturing of test equipment for testing electrical, radio, and communication circuits, and motors (excluding portable instrument transformers)

Facility	City	State	Employees	Status
Miratech Group LLC	Tulsa	OK	100–499	● ACTIVE
Mph Industries, INC	Owensboro	KY	100–499	● ACTIVE
Myron L Company	Carlsbad	CA	20–99	● ACTIVE
Naiad Dynamics US INC	Shelton	CT	20–99	● ACTIVE
National Filters INC	Harbor Beach	MI	—	● ACTIVE
Otto Instrument Service, INC.	Ontario	CA	—	● ACTIVE
Pacific Consolidated Industries LLC	Riverside	CA	—	● ACTIVE
Parr Instrument Company	Moline	IL	20–99	● ACTIVE
Photo-sonics, INC.	Chatsworth	CA	20–99	● ACTIVE
Picarro, INC	Santa Clara	CA	100–499	● ACTIVE
Polytek Development CORP	Easton	PA	20–99	● ACTIVE
Precision Airconvey LLC	Newark	DE	20–99	● ACTIVE
Precision Devices INC	Milan	MI	20–99	● ACTIVE
Progressive Surface INC	Grand Rapids	MI	100–499	● ACTIVE
Proportion Air INC	Mccordsville	IN	20–99	● ACTIVE
Pulsafeeder INC	Rochester	NY	20–99	● ACTIVE
Quality Thermistor, INC	Boise	ID	1–19	● ACTIVE
Quality Vision International INC.	Rochester	NY	100–499	● ACTIVE
Rantec Microwave Systems, INC.	Westlake Village	CA	—	● ACTIVE
RSRapiscan Systems INC	Torrance	CA	—	● ACTIVE
Rdf Corporation	Hudson	NH	20–99	● ACTIVE
RDR.e. Darling Co., INC.	Tucson	AZ	100–499	● ACTIVE
Rice Lake Weighing Systems, INC.	Rice Lake	WI	—	● ACTIVE
San Diego Composites, INC	San Diego	CA	100–499	● ACTIVE
Schneider Electric Systems USA INC	Foxboro	MA	500+	● ACTIVE

FactoryRegistry lists 3,820 facilities whose primary industry classification is one of the 4 industries above. This is a list by industry, not a list of makers: Census reports that establishments in these industries produced test equipment for testing electrical, radio, and communication circuits, and motors (excluding portable instrument transformers), in the shares shown above, and does not say which establishments. Where a plant’s own website or a federal registry names what that plant makes, it appears on the plant’s own page with the source named.