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The digital refractometer principle is based on the refraction of light as it passes through a liquid sample
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provides superior optical quality
Temperature level selection with thermostat control
Aquarium Air Pump visual colorimeter The digital refractometer principle isAquarium Air Pump Features: 100% brand new and high quality! Nice supply for people who like feeding aquatic pets. Made of environmental plastic material and fashionable curve design, durable for use. Low power, economic power saving, continuous operation and long service life. High performance, large volume, ideal for small and medium sized fish tank plus oxygen. Specifications: Model: RS 180 Color: Black Material: Plastic Voltage: 220V 240V, 50Hz
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