Class Akloholtester!

In short, the device works is very easy to use and reliable. What I like very much the clear, large and easy to read display. The case looks high quality finish (rubberized surface.) A friend of mine, the police officer, it had also compared with an official Dräger model. The measured values ​​were almost identical. One should mention, however, the fact that for each test (similar to police checks) a new mouthpiece should be used (for reasons of hygiene, as well as for the measurement accuracy). The TM-7500 uses here the good mouthpieces with rebreathing lock!
Conclusion: The device I can recommend any of a purchase decision intends and is unsure. I would buy it again at any time.