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3V 5V 8-Channel Optocoupler Isolation Module Input Voltage: DC 3
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it is compatible with iPhone
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Works with the following: Motorola CLP1010e CLP1040e CLPe446 CLP446e
Portable 2 in 1 Water Quality PH and Chlorine Level CL2 Tester Meter for Swimming Pool Spa Drinking Water Quality Analysis Monitor PH CL2 Chlorine Tester auspowers_batchthree 3V 5V 8-Channel Optocoupler IsolationPortable 2 in 1 Water Quality PH and Chlorine Level CL2 Tester Meter for Swimming Pool Spa Drinking Water Quality Analysis Monitor PH CL2 Chlorine Tester Read more Read more Chlorine Tester (PH CL2) Chlorine will also be depleted if the pool contains a lot of nitrogen (from debris, pee, sunscreen, or sweat) or other organic matter. As a result, it's best to test chlorine and pH levels on a regular basis. they can fluctuate from day to day depending on
