PPM Test strips.

Hello everyone, I am after info on where I can get the test strips used to determine the " parts per million" when making CDS, as it was used in the making of CDS video. I am in Australia and have tried MMS Australia but it is not listed. Thanks for any help.
geocant

Thanks Steve, on the video for the "overnight CD batch" it calls for 3000 parts per million test strips. The strips at Graingers are 500 ppm (#4EVX3) I will have another look at their site and do a search.
Thanks again for your help, George.

George, the 500ppm strips are the highest made.

Take 1ml of your CDS and put in 59ml of distilled water for a total of 60ml. That is a 1:60 dilution. Dip one LaMotte strip in the diluted solution for 2 full seconds, take out and wait 10 seconds. If your CDS is 3000ppm the strip color will match the 50ppm color on the LaMotte plastic case. 50ppm x 60 = 3000ppm

You can cut the strips lengthwise so you end up with 100 strips instead of 50.

Thanks JB13, I understand now. Will order soon.
Cheers, George.

You will find that the colors may be approximate - and worry a bit about an exact match - I wouldn't worry close is close enough. I also don't worry about the difference between 59mL in my water or 60mL in my water - it's easy to find measures that measure 30mL or 60mL here in the states, but you have to purchase lab equipment to measure 59mL - so I just use 60. As Jim has said, this is not rocket science.

Thanks Pam, I have a small digital scale, it might be better to weigh the 59-60 grams/mls. Anyway I suppose the accuracy is only as good as the test strips, and that is only a visual thing.
Cheers, George.