REK ( chinarek ) this is another brand in China this trading several products of electrical test and measurement equipment but they aim mostly Chinese factories as customers.
Regarding REK and programmable DC loads, Miss Hana Li kindly informed me that their products are not escorted with English software, because in their team there is no English speaking engineers.
Close examination of REK RK9713 DC load (600W version) makes obvious that this is Maynuo product design.
www.chinarek.com