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Property plant and equipment net (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | ---
Office premises | $ | $ 673 |  | $ 673 |
Leasehold improvements | $ | 67 |  | 67 |
Furniture, fixtures and office equipment | $ | 313 |  | 311 |
Motor vehicles | $ | 172 |  | 173 |
Testing equipment | $ | 32 |  | 32 |
Property, plant and equipment, gross | $ | 1,257 |  | 1,256 |
Less: accumulated depreciation and amortization | $ | (1,089) |  | (1,077) |
Property Plant And Equipment, Net | $ | $ 168 |  | $ 179 |
ZHEJIANG TIANLAN |  |  |  |
Building and leasehold improvements |  | ¥ 112,792 |  | ¥ 167,874
Furniture, fixtures and office equipment |  | 4,122 |  | 3,795
Motor vehicles |  | 4,478 |  | 4,610
Plant and machineries |  | 10,619 |  | 10,619
Property, plant and equipment, gross |  | 132,011 |  | 186,898
Less: accumulated depreciation and amortization |  | (68,506) |  | (82,252)
Accumulated impairment losses |  | 0 |  | (36,241)
Accumulated |  | 68,506 |  | 118,493
Property Plant And Equipment, Net |  | ¥ 63,505 |  | ¥ 68,405

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