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- Test Plugs Ltd. Incorporating Suffolk Gauges. Test Plugs Ltd was first established in 1975. and is ISO9002 registered. We are a privately owned company and our products are sold to; the heating, ventilation, air conditioning, refrigeration industries on and off-shore. Our products are used in many other processing industries from food to chemicals, from drinks to the oil industry. We find that ...www.test-plugs.com