These test kits are great, easy to use and work 100% of the time - IF you use the 510B addon holder. Without, well - check the other reviews for all the folks that cheaped out and suffered.

It worked great . Easy to use.

I have been using Titretes for a few years and have relied on them to make sulphite adjustments in white and rose wines. In the past they seemed to work very well but recently I have noticed slower reaction times for the color change even on freshly purchased vials. When they work they are great but they have not been reliable of late.

Titrets are very easy to use for white wines. Takes but a few seconds and a minimum of wine. Just be sure that you have the 'holder' for them, sold separately.

Easy to use. appears to be accurate enough. A bit expensive since they're not reusable. But that makes them more convenient since there's nothing to prepare or mix, etc.

We started using Titrets for measuring SO2 levels in white wine. It is a nice and easy to use instrument, but two negative comments:a) It is impossible to use without titrettor.b) Instructions are not clear enough. Total lack of pictures. We managed to use titrets thanks to instructions available in YOUTUBE. Also learned a lot of other interesting stuff available from titrets people.

I use Titrets to test for S02 levels in white wine. It always reads a little high, maybe 10-15% but you can correct for that error. I find it easy, inexpensive and I have never had a white wine develop bacteria problems when using Titrets to test for S02.Red wines are considerably more difficult to test with Titrets unless it is very light in color as color change is critical for accurate reading. I don't use the product for red wines.