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Sensor,Ozone,0-1 PPM,for GD-K77D,low humidity * Indicates required fields Review title: Overall rating: * Please select 5 - Excellent 4 - Good 3 - Average 2 - Poor 1 - Very Poor How long have you owned this product?: Please select 0 - 1 day 1 day - 1 week 1 week - 1 month 1 month - 1 year more than 1 year Pros :  * (1,000 characters max) Cons :  * (1,000 characters max) Your Nickname: *