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2. Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment |
Office premises |  | 47 to 51 years
Leasehold improvements |  | over terms of the leases or the useful lives whichever is less
Furniture, fixtures and office equipment |  | 3 to 5 years
Motor vehicles |  | 4 years
Testing equipment |  | 3 years
ZHEJIANG JIAHUAN |
Property, Plant and Equipment |
Land use right |  | 50 years
Buildings |  | 20 years
Plant and machinery |  | 5 to 20 years
Office equipment |  | 3 to 10 years
Motor vehicles |  | 5 to 10 years
ZHEJIANG TIANLAN |
Property, Plant and Equipment |
Land use right |  | Over terms of the leases
Office premises |  | 47-50 years, with 5% residual value
Leasehold improvements |  | over terms of the leases or the useful lives whichever is less, with 5% residual value
Plant and machineries |  | 5 to 10 years, with 5% residual value
Furniture, fixtures and office equipment |  | 3 to 5 years, with 5% residual value
Motor vehicles |  | 1 to 8 years, with 5% residual value

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