The Hipshot D-Tuner is admittedly expensive, but is a precision piece of engineering.
I need to play notes below low-E for a number of different genres, but could never get the hang of a five-string bass. This device suits my purposes perfectly. It comes with clear, concise instructions and is easy to fit.
In use, it is simply a case of flipping the lever to drop the fourth string to D. Its operation is accurate and stable.
I found it so useful that I bought another for my fretless bass. This has the added advantage of facilitating parallel octaves across the second and fourth strings.
Recently I played a gig where I needed that low D, just for one song section. So I ordered myself the D-Tuner to go on my old Warwick, set it up in no time and after a little tweak, got it bang in tune. Worked perfectly! I also play in a band where half of the songs are in drop D, no more faffing about tuning after each song! It's great. Well built, accurate, reliable and easy to fit and use.
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