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Summary of significant accounting policies (Details) | 12 Months Ended
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Dec. 31, 2019
Office premises |
Useful lives | 47 to 51 years
Leasehold improvements |
Useful lives | over terms of the leases or the useful lives whichever is less
Furniture, fixtures and office equipment |
Useful lives | 3 to 5 years
Furniture, fixtures and office equipment | ZHEJIANG TIANLAN |
Useful lives | 5 years, with 5% residual value
Motor Vehicles |
Useful lives | 4 years
Motor Vehicles | ZHEJIANG TIANLAN |
Useful lives | 5 years, with 5% residual value
Testing Equipment |
Useful lives | 3 years
Land Use Right | ZHEJIANG TIANLAN |
Useful lives | Over terms of the leases
Buildings and leasehold improvements | ZHEJIANG TIANLAN |
Useful lives | 11 to 50 years, with 5% residual value
Plant and machineries | ZHEJIANG TIANLAN |
Useful lives | 5 to 10 years, with 5% residual value

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