Guangzhou Threewin Electronic Technology Co., Ltd

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1. pen type TDS/US meter

Features
Durable, anti-explosion;
Check the performance of your water filter;
Check nutrient levels in water for plants and fish;
Competitive price, high quality, long lifetime;
Be sure your drinking water is at the right TDS level;
Measure ...

2. 0.01 Accuracy Waterproof pH Meter pH-712 with Night Vision

High accuracy Waterproof pH Meter with Night Vision

OPERATION
Remove the protective cap. Do not be alarmed if white crystals
appear around the cap. This is normal with pH electrodes and
they dissolve when rinsed with water.
Turn the ...