Formaldehyde detector test strip home disposable new house test agent box professional new house air quality self-test box

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Formaldehyde self-test box ----1 box ---- (25 square meters one-bedroom available)
Formaldehyde self-test box ---- 2 boxes of ---- (50 square meters one bedroom and one living room available)
Formaldehyde self-test box ---- 3 boxes of ---- (75 square meters two bedrooms and one living room available)
Formaldehyde self-test box ----4 boxes of ---- (100 square meters three bedrooms and one living room available)
Formaldehyde self-test box ---- 10 boxes---- (250 square meters two rooms and one hall test twice)

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Color classification:: Formaldehyde self-test box ----1 box ---- (25 square meters one bedroom available) Formaldehyde self test box ----2 boxes ---- (50 square meters one room and one living room available) Formaldehyde self test box ---- 3 boxes ---- (75 square meters two bedrooms and one hall available) Formaldehyde self test box ----4 boxes ---- (100 square meters three bedrooms and one living room available) Formaldehyde self test box ---- 10 boxes ---- (250 square meters two rooms and one hall test twice)