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Target chemical: Free residual chlorine
Sampling method: Immersion method
Measuring range: 0.4-5.0ppm
Sampling time: 3 mins
Sample volume: Over 5 ml
Detectable limit: 0.1ppm
Shelf life: 2 years
Operating temperature: 5～40℃
Operating PH: 2-10
Reading: Direct reading from the scale
Colour change: pale pink → purple
