Visual test kits are a cheap, quick and easy way to test for different parameters in water samples. The VISOCOLOR range from Macherey-Nagel are a range of visual colorimetric and titrimetric test kits. The Range includes VISOCOLOR alpha, ECO and HE. To help you find which kits are best suited for your needs the differences and benefits of each are detailed below. Titrimetric Test Kits A ...