Hsi Smoke Check Smoke Detector Tester 25 Oz Can. New can hsi smoke check smoke dteector tester 2.5 oz institutional size! All brand new unused cans. Will test both photoelectric & ionization smoke detectors to ensure that the circuitry, alarm and opwer is functioning and that they are actively sampling the air for any hint of a fire. over 200 tests per can! More information & msds here. Additional cans are $1.00 each. We try to inspect all items thoroughly, and will note any apparent defects in the item description.

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