{"product_id":"2-vintage-panel-meters-with-classic-box-triplett-model-321-1-readrite-d-c","title":"2 Vintage Panel Meters With Classic Box Triplett Model 321-1 Readrite  D.C.","description":"\u003cp\u003e2 Vintage Panel Meters With Classic Box Triplett Model 321-1 Readrite  D.C.\u003c\/p\u003e\u003cp\u003e Triplett Model 321-1 D.C. Amperes panel meter, which is an analog electrical test meter. \u003c\/p\u003e\u003cp\u003eProduct Details\u003c\/p\u003e\u003cp\u003eBrand: Triplett Electrical Instrument Company (founded in Bluffton, Ohio)\u003c\/p\u003e\u003cp\u003eModel: 321-1\u003c\/p\u003e\u003cp\u003eFunction: Measures direct current (D.C. Amperes)\u003c\/p\u003e\u003cp\u003eScale: The full-scale reading is up to 1200 Amperes.\u003c\/p\u003e\u003cp\u003eMovement: It is a 50 mV (millivolt) movement meter, meaning it requires an external current shunt that provides a 50 mV output at 1200 Amperes to function correctly with the scale shown. Ammeters designed for currents over 50 Amperes typically use such an external shunt system.\u003c\/p\u003e\u003cp\u003eVintage: Triplett has been manufacturing such panel meters for decades, with the company founded in 1904.\u003c\/p\u003e\u003cp\u003ePatents: The face lists patents 2,346,521 and 2,364,724, which date to the 1940s. \u003c\/p\u003e\u003cp\u003eCompany Information\u003c\/p\u003e\u003cp\u003eTriplett is a well-known manufacturer of quality testing tools with a long history in the United States, currently owned by Jewell Instruments. They are famous for their robust and reliable analog meters, such as the Model 310, which is still in production today.\u003c\/p\u003e\u003cp\u003eD.C. Amperes panel meter made by Readrite Meter Works in Bluffton, Ohio, USA. \u003c\/p\u003e\u003cp\u003eProduct Information\u003c\/p\u003e\u003cp\u003eManufacturer: Readrite Meter Works\u003c\/p\u003e\u003cp\u003eLocation: Bluffton, Ohio, USA\u003c\/p\u003e\u003cp\u003eType: D.C. (Direct Current) Ammeter (measures current in amperes)\u003c\/p\u003e\u003cp\u003eRange: The scale on the dial indicates a range from 0 to 3 Amperes\u003c\/p\u003e\u003cp\u003eTypical Use: Meters like this were commonly used in early radio test equipment, educational electronics kits, and industrial control panels from the mid-20th century.\u003c\/p\u003e\u003cp\u003eCollectibility: Readrite meters are well-known among collectors for their durable, classic design. \u003c\/p\u003e\u003cp\u003eSelling as pictured.\u003c\/p\u003e\u003cp\u003eMore than welcome to pick up at shop in Butler PA \u0026amp; save shipping.\u003c\/p\u003e\u003cp\u003e013026-JM9\u003c\/p\u003e","brand":"cyclewarehouse.online","offers":[{"title":"Default Title","offer_id":46554436665506,"sku":"013026-321-1-Panel Meters","price":48.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0335\/9824\/2861\/files\/img2026-01-30-11-07-50-401.jpg?v=1769806322","url":"https:\/\/cyclewarehouse.online\/products\/2-vintage-panel-meters-with-classic-box-triplett-model-321-1-readrite-d-c","provider":"cyclewarehouse.online","version":"1.0","type":"link"}