it was about $300.
at that time the value it showed was only 0.05-0.15μs/h.
so i doubted the measuring instruments showed good value or not.
But this time,,,under this situation in japan
the value it showed was very close to the value media showed.
and then i start to measure many place inside the house and outside the house.
the value outside is a little higher these days.
and inside the house without ventilation is very low.
(off course i stopped the ventilation system)
it showed high value near the air cleaner inside the house, so air cleaner seems important equipment when in the situation like in japan.
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