Custom Premix Selecting "Custom Premix" option means that all of the beads you have chosen will be premixed in manufacturing before the kit is sent to you.
for chlorine test (DPD) 0.010 - 6.00 mg/l Cl₂ free chlorine: Cl₂-1 and Cl₂-2 total chlorine: Cl₂-1, Cl₂-2, and Cl₂-3 600 Tests Spectroquant®更多 >>
for chlorine test (DPD) 0.010 - 6.00 mg/l Cl₂ free chlorine: Cl₂-1 and Cl₂-2 total chlorine: Cl₂-1, Cl₂-2, and Cl₂-3 600 Tests Spectroquant® 更少<<