| 90.24 |  | Machines and appliances for testing the hardness, strength, compressibility, elasticity or other mechanical properties of materials (for example, metals, wood, textiles, paper, plastics) | 
| 90.25 |  | Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments | 
| 90.25 |  | Thermometers and pyrometers, not combined with other instruments | 
| 9025.19 | 010 | - Of electrical type | 
| 9026.20 | 010 | - Of electrical type | 
| 90.27 |  | Instruments and apparatus for physical or chemical analysis (for example, polarimeters, refractometers, spectrometers, gas or smoke analysis apparatus); instruments and apparatus for measuring or checking viscosity, porosity, expansion, surface tension or the like; instruments and apparatus for measuring or checking quantities of heat, sound or light (including exposure meters); microtomes | 
| 9027.10 | 000 | Gas or smoke analysis apparatus | 
| 9027.80 |  | - Of electrical type | 
| 9027.80 | 011 | -- Instruments and apparatus for analysis | 
| 90.28 |  | Gas, liquid or electricity supply or production meters, including calibrating meters therefor | 
| 9028.30 | 000 | Electricity meters | 
| 9029.20 | 010 | - Of electrical type | 
| 90.30 |  | Oscilloscopes, spectrum analysers and other instruments and apparatus for measuring or checking electrical quantities, excluding meters of heading 90.28; instruments and apparatus for measuring or detecting alpha, beta, gamma, X-ray, cosmic or other ionising radiations | 
| 9030.40 | 000 | Other instruments and apparatus, specially designed for telecommunications (for example, cross-talk meters, gain measuring instruments, distortion factor meters, psophometers) | 
| 9030.89 | 091 | - Spectrum analyzers | 
| 9031.80 |  | - Of electrical type | 
| 9032.10 | 010 | - Of electrical type | 
| 9032.81 | 000 | Hydraulic or pneumatic | 
| 9032.89 | 010 | - Of electrical type | 
| 91.01 |  | Wrist-watches, electrically operated, whether or not incorporating a stop-watch facility | 
| 9101.11 | 000 | With mechanical display only | 
| 9101.19 |  | Other wrist-watches, whether or not incorporating a stop-watch facility | 
| 9101.91 | 000 | Electrically operated |