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2. Summary of significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2015
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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