Vislone
Multifunctional Digital 10 1 Water Quality Tester Portable High Accurancy Test Pen Measurement Tool PH/TDS/EC/Salinity/ORP/H2/S.G/Temperature

$25
From Amazon UK
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Product Details

One button to switch function. Whole machine waterproof. Battary can be replaced easily. Portable design for easy carrying and storage. Quick and accurate test.

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