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- Convenient device size
- Battery life
- Construction quality
- Easy to use
- Value for money
- Does it have a nice taste?
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- Construction quality
- Writing Accuracy
- Writing Comfort
- Ergonomics
- Ink duration
- Does it dry quickly on paper?
- Value for money
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- Speed
- Construction quality
- Limescale buildup
- Value for money
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- Measurement reliability
- Easy to use
- Value for money
- I would buy it again
- Speed of result diagnosis
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- Effectiveness
- Construction quality
- Value for money
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- Quality
- Was it interesting enough?
- Fun
- Value for money
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- Effectiveness
- Construction quality
- Value for money
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- Convenient device size
- Battery life
- Does it fill easily?
- Construction quality
- Air flow
- Easy to use
- Variety of spare parts/accessories
- Value for money
- Are the spare parts economical?
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