Another option would be a Hipshot drop D tuner. I had one for years and it did the job well.
Then I had the opportunity to play in Mexico. I couldn't bring my 4, but it was arranged for me to borrow a 5 string (Ibanez SR505). It was the only bass I could get so I was forced into playing it against my will. I spent an afternoon getting to know it and played the couple of gigs we had with it.
I came home and immediately bought a Yamaha BB735a... Sold my 4 strings and bought a Sandberg California II. I'm a 5er guy now.
Then I had the opportunity to play in Mexico. I couldn't bring my 4, but it was arranged for me to borrow a 5 string (Ibanez SR505). It was the only bass I could get so I was forced into playing it against my will. I spent an afternoon getting to know it and played the couple of gigs we had with it.
I came home and immediately bought a Yamaha BB735a... Sold my 4 strings and bought a Sandberg California II. I'm a 5er guy now.