Calibration of glassware

The volume of a volumetric glass instrument is not always exactly the same as the size it indicates. Due to the thermal expansion and contraction properties of glass, the volume is different at different temperatures. Therefore, for the analysis with higher accuracy requirements, the gauge must be corrected. The calibration method of the capacity vessel usually has two methods: weighing method and relative calibration method.

Air Humidifier

New home electric cool mist ultrasonic essential oil diffuser therapy air humidifier filter led air scent fragrance diffuser

This product design is novel, the Oriental fragrance culture combined with modern science and technology, the principle of using ultrasonic ultrasonic vibration plant fragrancetherapy essential oil and water to spray 5 microns of superfine particles, producing a large number of negative ions are more likely to be inhaled by human body, give full play to the essence of natural fragrancetherapy effect, help you relax in stressful work life, achieve healthy nerves, skin moisturizing effect.

Air Humidifier,mini air humidifier,air conditioning humidifier,USB air humidifier,cool mist humidifier

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