tender for supply of water level recorder (data logger based) , water level recorder (data logger based) , technical specifications • working principle : capacitance based • applications: surface water • measurement range : 1.0 m • resolution: ± 0.10mm ; accuracy: ± 1.0mm • ambient temperature sensor resolution ± 0.0625°c, accuracy ± 0.5°c • memory capacity : 60,000-including logger temperature • dimensions: logger diameter: 46mm. length = 160mm • battery/life: alkaline aa 1.5v x 2; 2 years - based on 15min recording intervals with a 5m sensor cable • operating temperature: 5 to 55°c • waterproof options : ip67: 1m for 30min • data collection device : phone/tablet with android 6.0 or greater. • data communications : wireless bluetooth le 4.0 with 1-year standard cloud subscription for remote monitoring.