Instrument Manufacturers

DMM Multimeter

Siglent Technologies
http://www.gossenmetrawatt.com Gossen Metrawatt
http://www.fluke.com Fluke
http://www.keysight.com Keysight (formerly HP/Agilent)
https://www.bkprecision.com BK Precision
http://www.brymen.com Brymen
https://www.ueitest.com UEi Test Instruments
https://www.impac.com.br[1] Impac Tecnologia
APPA Technology Corporation Aim TTi (Made in England)

ACDC POWER SOURCE & LOAD

http://www.zentro-elektrik.de Zentro
http://www.elektroautomatik.de EA Elektro Automatik
http://www.statron.de STATRON
http://www.itechate.com/en/ ITech

CURRENT PROBES

http://www.cybertek.cn/en Cybertek (Source manufacturer of some Siglent current probes)

uC

http://www.atmel.com Atmel (AVR,ARM,8051)
http://www.microchip.com (Pic)
http://www.cypress.com (PSoC)