SOLO A3-001 Solo Smoke Detector Tester Aerosol 250ml | The Safety Centre, UK
Arctic Hayes PH043A 1 x Tester 140 ml SleepSafe Spray, Sensor in Smoke Alarms for Domestic and Business Use, 40 Tests per Can (140ml), Blue : Amazon.co.uk: DIY & Tools
Solo C3 Carbon Monoxide Detector Tester Aerosol 250ml - Discount Fire Supplies