Okay, I opted for big display in preference to real needle, and I now got a shiny new
Korg LCA-120.
First impressions: display is big (3" wide scale) and well readable, with and without back light. Back light is very cool, and I can plug in an external power source. Some reviewers said the battery cover is flimsy and can get lost. It is a bit flimsy, and I stuck some tape over it for additional support. There are four big and six small buttons, to change modes etc. The small buttons are really small and it would be nice if they would be bigger. But they work fine.
I like the foldup display, as I can angle it for best view. And folding the display down shuts off the tuner, and offers some protection. I also like the "focus tune" mode: when a note played is within +-10 cents the +-50 cent scale changes into a +-10 cent scale, with a dot every 2 cents, making it easier for very precise tuning. PS: I just realise that to use "focus tune" mode and tune a whistle for just intonation, I also need to program the tuner (see next).
Apart from using the standard ET one can program the tuner for one custom temperament, by setting cent deviation from ET for each note of the scale. This programmed temperament stays in memory. Setting deviations is straight forward, but it just take time and a lot of button pressing. I may find this mode very useful. But I would need to change the programming when changing the whistle key. It would be marvellous if there would be a transpose function (for all twelve semitones). This is one major lack in this tuner.
Calibration: one can set A from 410Hz to 480Hz in one Hertz steps.
With a suitable chart of temperature/frequency dependancy one could set the tuner up to compensate for different room temperatures when making a new whistle or flute. The calibration value is displayed in the top right corner. The frequency of a played note is not displayed (the Shaku software tuner displays both).
Sound mode: The tuner can generate any note from low C2 to high C6. The wave form is square, which gives a tone with plenty of harmonics. One cannot change this wave form (as one can with the Shaku software tuner). There is a volume control dial and an earphone output, so that may come handy.
Volume meter: this is quite basic. The display of it can be turned on or off. I am not sure how useful it may be. My initial response is that I have a far better feel of blow pressure than this meter can reflect optically to me, and I will disregard it.
Overall I am happy with this tuner, especially with its large display and the "focus tune" mode, and expect it will do well in my workshop.
PS: I read that Korg does not manufacture the LCA-120 any longer, but there seemed to be plenty of sources to buy one.