I have been using this type of tuner for a number of years now and have always found it easy to use and very responsive.
The tuner works with an external microphone and also via a jack plugin

The tuner is well designed and works well in low light conditions the tuner works very well and i have had no real issues over the last few years and i cant recommend this product enough.
The tuner fits nicely into a pocket and hard case. the tuner has also been very well designed and is very hardwearing, my tuner has been dropped many times and it still works
The tuner although isn't water proof it i have spilt a drink or two over the tuner and it seems to keep working

The battery life is also very good and i find i usually change the battery every year or so.

In conclusion this tuner works very well and i am very impressed with this product.
The product works very well and offers great value for money

I would recommend this product to anyone looking for a new tuner or a replacement