One annoying issue I have with the majority of digital hygrometers is that the humidity level displayed jumps by 5% or more as the temperature goes past specific points. For example, on one unit, if the hygrometer shows 65% at 20.0C, it will jump to 60% at 20.1C and vice versa if the temperature falls back to 20.0C. A similar jump occurs about 23C, 26C and so on.
With this analogue hygrometer, it does not jump about with temperature changes and thus appears to be more accurate. The difference is very noticeable when I open a window on a cool day. This hygrometer needle continuously moves down as the humidity level drops, where as the digital units would count down one digit at a time, then suddenly jump back up at least 5% as the temperature falls below a specific point and then continue counting down. When the temperature is 21C, this is within 1% of two of my digital hygrometers.
It has a few other advantages such as being battery-free, clearly showing the condition of the room and the ability to calibrate the hygrometer (unlike digital units). A digital hygrometer with an unhappy face does not give a clue how low or excessive the humidity past the comfort range, where as it's clear from this analogue display how far the needle is above or below the "Perfect" zone, especially to anyone unfamiliar with what the ideal range is.
The only negative point I have is that this does not have a desk stand. It needs to be hung, such as on a picture hook.