Altimeter, Barometer, Weather Station, Anemometer, Lux Meter, Sound Level Meter, Tachometer, Vibration Meter, Hand Refractometer, Thermo Hygrometer, Barometer, Digital thermometer, Ph Meter, Tds Meter, Conductivity Meter, Salinitymeter, Turbiditymeter, Chlorine Meter, Colour Analyzer etc.