GB 20517 China standalone smoke detector standard

fire detector tester direct from Wanlin Fire Protection — 12-year factory experience, WL-ST900 smoke detector tester certified CE/UL 268A/EN 54/NFPA 72/BS 5839/AS 1851. Key specs: Complete Test Kit: Smoke Tester + Heat Tester + Sensitivity Meter + Telescoping Wand + Multi-Brand Adapters + Cloud Platform, Bluetooth + WiFi + Cloud Platform + Mobile APP + PC S···