| | Key Instruments Flowmeter Pocket Oxyg 8 Lpm PM8OXY | 3 | ¥399.90 | ¥399.90 | | ¥399.90 |  |
| | Key Instruments Flowmeter Pocket Air 8 Lpm PM8AIR | 3 | ¥399.90 | ¥399.90 | | ¥399.90 |  |
| | Key Instruments FR5L79PI-D浮子流量计 | 42 | ¥4220.00 | ¥4220.00 | | ¥4220.00 |  |
| | Key Instruments Flowmeter Pocket Oxyg 2.5 Lpm PM2.5OXY | 3 | ¥399.90 | ¥399.90 | | ¥399.90 |  |
| | Key Instruments FR5L79SI-D浮子流量计 | 58 | ¥5810.00 | ¥5810.00 | | ¥5810.00 |  |