You could try a UNI-T UT210E which I have & seems to be ok or same make UT211A or B. Another one I have is the CEM DT-9809 which is alright, but not sure if it's still available.
The "HandyMAN TEK775" looks identical to the "Dilog DL6518" but only costs around £70+VAT. Probably not as good as the Megger, but still covers a usable range of currents from a few mA leak to 200A load monitoring.
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