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Almost all positive (“+”) natural ions during fair weather come from radioactivity. Natural negative ions usually come from radioactivity and evaporating water. Air ions cannot be produced without an energy source, such as heat or flame, radioactivity, frictional rubbing, electricity, evaporation (which is a heat process), etc. You can produce negative ions directly by rubbing cotton fabric (or your hair) against a plastic object, which will then briefly emit negative ions.

    KT-401A Mini Air Ion Counter +/-ve Positive / Negative Ion Tester

    Measure position & negative air ion in high concentration condition

    SG$86.80
    Out of stock
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    KT-401P Mini Air Ion Counter negative -ve ion tester with peak hold
    Recommend
    Labels: Recommend 

    Measure negative air ion in high concentration condition with maximum hold

    SG$96.80
    Stock available
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    AlphaLab AIC2 Air Ion Counter +/- Air Ions Densities with Protection Case

    Quality Air Ion Counter measures the number of positive and negative ion in air.

    SG$1,990.00
    Backorder in from Mid September 2019
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    AlphaLab AIC Air Ion Counter Meter Reading +/- Air Ions Densities

    Quality Air Ion Counter measures the number of positive and negative ion in air.

    SG$1,280.00
    Backorder in 2 weeks
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    COM-3010PRO Negative Ion Counter / Tester for ores
    SG$1,998.00
    Backorder in 2 to 4 week
    Add To Cartmore info