BACK STORY
With new twin boys in the house we discovered that our existing old-school-style thermometer (a tube containing liquid glued along a scale) was showing completely the wrong temperature. The ideal temperature for babies, seemingly is around 18 deg Celsius (about 64.4 deg F). It turns out that the thermometer had fallen apart years ago and had simply been glued back together by some idiot (me!), but in the wrong place. So we needed a new one. Or two.
I read a number of favourable reviews for this model and so ordered two: one for the boys' bedroom and the other for the living room.
CONSISTENT
When they arrived they proved to be simple to set up (make sure the battery is seated correctly by removing the protective plastic strip) and then I sat them side-by-side for a few hours to see how consistent they were -- I expected them to display roughly the same temperature.
A few hours later and they were pretty spot on. At best they were displaying exactly the same reading. At worst they were about 0.1 degree out. I could live with that.
ACCURACY
We've not been able to carry out any kind of scientific tests to check its accuracy, but as a rough guide the built-in thermometer on the baby monitor displays roughly the same temperature (give or take a degree or two), but as it's on the other side of the room from this one I'd expect different areas of the room to register different readings.
NIGHT LIGHT
A small button on the side, which needs little more than pressing your finger very gently on it -- almost swiping your finger across it, displays a blue night-light for about 5 seconds or so.
When the light is on there is a very faint buzz, which I'd expect from something at this price, but it's certainly not loud enough to disturb the children.
CONCLUSION
I'd certainly recommend these thermometers to anyone. They are small, discreet, accurate, consistent and have proved to be a real asset and provide piece of mind.