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It has an LED which works as the Power Indicator
Low voltage and power consumption
With this gauge
Power density of 5μW / cm2 / step
you will get the pH value easily
Small Liquid Pump (4 L/Min) USB to Serial RS232 Converter Cable It has an LED whichIntroduction : Small Liquid Pump (4 L Min) is submersible water pump with a high performance brushless DC pump with long life, small size, high efficiency, low noise and low power consumption and uses a high performance stainless steel shaft. It is submersible and entirely waterproof (IP68) with flow rate of 4L MIN. The axis is enclosed with static sealing, not dynamic, which can avoid leaking problems. Can be used in many fields, such as cooling