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Feed all corals without polluting the water
If possible switch off the skimmer briefly
will be taken up by plants quicker
(1) Iron-EDTA bonding is very strong
The auto shut-off feature assures the battery life will not be drained if you forget to turn it off
Hanna Instruments Checker Total Chlorine Colorimeter NEU Feed all corals without pollutingThe HI 761 Checker is a simple, accurate, and cost effective way to measure ultra low ranges of total chlorine. Designed as a more accurate alternative to chemical test kits, the HI 761 provides quick, accurate results in four easy steps. The HI 761 uses an adaptation of the USEPA method 330. 5. The reaction between the chlorine and DPD reagent causes a pink tint in the sample. Features: Small palm sized design Accurate from 5ppb 5% of reading