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v3.21.1

Land use right, net (Details 1) - ZHEJIANG TIANLAN - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amortization expense | ¥ 159 | ¥ 149 | ¥ 149
2021 | 159 |  |
2022 | 159 |  |
2023 | 159 |  |
2024 | 159 |  |
2025 | 159 |  |
Thereafter | 4,352 |  |
Total | ¥ 5,147 |  |

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