tender for supply of digital flow meter(current meter) , digital flow meter(current meter) , speed measurement - standard size propeller for air velocity measurement units km/h, m/s, cm/s, mph, fps, knots and beaufort resolution 0.1 for all units (except cm/s: 3 cm/s) maximum speed 150 km/h (except cm/s: 999 cm/s) propeller diameter ø 20mm measurement range from 1 to 30 m/s minimum sensitivity 3 km/h - 1 m/s precision ± 2% fs speed measurement - water propeller for water velocity measurement units km/h, m/s, cm/s, mph, fps, knots and beaufort resolution 0.1 for all units (except cm/s: 3 cm/s) maximum speed 150 km/h (except cm/s: 999 cm/s) propeller diameter ø 60mm measurement range from 0.1 to 10 m/s minimum sensitivity 0.3 km/h - 0.1 m/s precision ± 2% fs off-axis error ± 20° / ± 3% fs temperature measurement - for ambient temperature measurement units °c, °f, °c felt and °f felt thermometer accuracy ± 0.2°c resolution ± 0.1°c functions measurement of ambient, perceived, minimum, average and maximum temperature should contain a digital meter, a telescopic/collapsible 1-m long aluminium probe fitted with an impeller/propeller and a compact case for transporting and storing the whole kit.