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This is a tool I developed some time ago. It is always a work in progress so things have been added. If there any features you think shoudl be addedd then please discuss in the relevant forum Battery Size Calcs for Grade 1-4 Intruder Battery Size Calcs for BS5839 Fire Alarms Voltage Drop Caculator Lens Calculator DVR Hard Disk Size Caculator IP Camera Bandwidth Calculator Serial PRinter Sound Level Calculator (to calc sounder levels) EN50131 Risk Assements (Beta) HAS Risk Asse