Best copper test strips in the world Copper is very effective at controlling algae in swimming pools, but it must be properly regulated. If the level is too low, your water will turn green which is expensive and time consuming to fix. If it's too high, you could get staining which is also difficult to fix. Most copper test strips are not very accurate. It's hard to distinguish between the colors so it's hard to be confident of the levels. Usually, the level is higher than what the test shows which means you are using up your copper products too quickly and could get nasty stains. The drop tests are the most accurate, but they are also the slowest and most expensive. It's hard to distinguish the blue color used in the reading, vs the purple in our strips. Don't be fooled by strips that offer more than one test. It's usually a tradeoff in accuracy between the various tests which means you don't get an accurate result for anything. The process used for detecting copper vs. pH, alkalinity and other metrics is different so it doesn't make sense to combine them. The team at Think Minerals scoured the earth for the best copper test strips for the money and have found these. They are the best overall for cost, speed and accuracy. Fast, easy and accurate without breaking the bank Fast Read copper level in 10 seconds Easy No counting drops or long waits - Purple color is easier to read than blue Accurate The most accurate test strips on the market - precise to 0.1ppm Cost Effective Long shelf life at a competitive price Copper Test Strips Pool Check Hach Lamotte Add to Cart Add to Cart Add to Cart Add to Cart Price $12.99$12.99 $15.99$15.99 $20.95$20.95 $17.51$17.51 Color Purple Purple Blue Blue Speed 10 seconds 30 seconds 30 seconds 180 seconds Accuracy Great - 0.1ppm Good - 0.2ppm Poor - 0.3ppm Excellent - 0.05ppm Shelf Life 3 years 2 years 2 years 1-2 years Cost Moderate Low Moderate High