measuring instruments

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• Measurement & Analysis Instruments 2PCS PH Meter Tester Pen Soil Water PH Value Detector Monitor 0.00-14.00ph Precision Glass Probe Water Quality Tester Good Deal US $19.59
• Measurement & Analysis Instruments Water Cooling Flow Meter Indicator Light-emitting for Computer PC Liquid Cooling System CPU - White POM with Plug Connector Good Deal US $73.49