supply and installation of various items for architecture deptt , of nit hamirpur -2 microphone ( integrated for video conferencing ) nwired / usb type, boundary layer form factor, 29 dba equivalent noise level, 39 db signal to noise ratio, 2 years warranty n 3 data logger: ntemperature & humidity ncomplete with built-in humidity sensor ( 0 to 100%rh ±5% rh ) and temperature sensor ( -20 °c to +70 °c±0.5 °c °c ) , wrist strap using 9v battery, 16, 000 readings storage, 1min. to 24hrs, 1 year warranty n 4 4-in-1 environmental meter ncomplete with built-in humidity sensor ( 10 to 95%rh+5% rh ) , light sensor ( lux: 0 to 20, 000lux ) , vane wheel ( 0.4 to 30m / s ) , temperature sensor ( 0 to 50°c ±1.0 °c ) , 9v battery, 32, 000 readings storage, 1sec. to 24hrs, 2 years manufacturing warranty n 5 data logger: ndigital lux meter nmeasure range: 400, 000lux, ±5%±10d ( <10, 000 lux ) accuracy, 0.1 lux / 0.01fc max. resolution, 1.5 times / second measuring rate, 1 year warranty n 6 3 tb hard disk n3 tb external hard disk n