- TPI (Test Products International)
- - TPI imadziwika ndi akatswiri ambiri monga "Safety Green Meter Company". Zomwe tizitetezera zimapezeka mosavuta ndikuyimira Chofunika ndi Chitetezo. Zambiri zimatchulidwa ku ma US ndi ma Canada (cULus) ndipo amathandizidwa ndi chaka 3, palibe chitsimikizo chachinyengo.
Mzere wa mankhwala a TPI umaphatikizapo Multitesters Digital, Digital Clamp-Testers, Thermometers, Oscilloscope Probes, Connector Kits, Test Lead Sets ndi Chalk, Gas Analysis Instruments, Oscilloscopes Handheld ndi BNC Cables. Zida zokhazikika ndi malo okonzanso malo alionse.
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