Testo India Pvt. Ltd. Offers Precision Manometer with Switchable Measuring Ranges. Testo India Pvt. Ltd. Manufactures various instruments to measure several process parameters like temperature, humidity, air velocity, dew point, flue gas, sound level, light, thermal imaging etc. Precision Manometer with Switchable Measuring Ranges is suited to check flue gas draught, differential pressure in the combustion chamber compared with ambient pressure or gas flow pressure with high resolution.