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Zeal Temperature and Humidity Digital Hygrometer PH1000
Price :
৳1350
Estimated Shipping Time: 7 days
Product SKU: R023353mlL
Digital Thermo-Hygrometer. Used to measure temperature and humidity. The genuine GH Zeal product. All the quality and assurance of a Zeal product. Brand: Zeal, Origin: England, Made in China
The Thermo-Hygrometer model PH1000 displays humidity over the range of 10 to 99%rh and temperature over -50 to + 70°C or equivalent °F with a 0.1°C/°F resolution. It also incorporates a 12/24 hour clock. The instrument is housed in a white ABS case which has a foldaway stand and keyhole slot for wall hanging.
Reads temperature and records maximum / minimum temperatures the unit has been exposed to since the last time the unit has been reset.
Product Dimension: 11cm x 7cm x 1.4cm
Measuring range:
Temp: -50ºC/+70C (-58ºF/+158ºF) Humidity: +10%RH to 99%RH
Accuracy:
Temp: +/- 1ºC (2ºF) Humidity: +/- 5% RH
Display resolution:
Temp: 0.1ºC (0.1ºF) Humidity: 1%RH
Battery:
One 1.5 volt AAA
A hygrometer is an instrument used to measure the amount of water vapor in air, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, a mechanical or electrical change in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity. Modern electronic devices use temperature of condensation (called the dew point), or changes in electrical capacitance or resistance to measure humidity differences. A crude hygrometer was invented by Leonardo da Vinci in 1480. Major leaps came forward during the 1600s; Francesco Folli invented a more practical version of the device, while Robert Hooke improved a number of meteorological devices including the hygrometer. A more modern version was created by Swiss polymath Johann Heinrich Lambert in 1755. Later, in the year 1783, Swiss physicist and Geologist Horace Bénédict de Saussure invented the first hygrometer using human hair to measure humidity.
The maximum amount of water vapor that can be held in a given volume of air (saturation) varies greatly by temperature; cold air can hold less mass of water per unit volume than hot air. Temperature can change humidity.
Prototype hygrometers were devised and developed during the Shang dynasty in Ancient China to study weather.[1] The Chinese used a bar of charcoal and a lump of earth: its dry weight was taken, then compared with its damp weight after being exposed in the air. The differences in weight were used to tally the humidity level.
Other techniques were applied using mass to measure humidity, such as when the air was dry, the bar of charcoal would be light, while when the air was humid, the bar of charcoal would be heavy. By hanging a lump of earth and a bar of charcoal on the two ends of a staff separately and adding a fixed lifting string on the middle point to make the staff horizontal in dry air, an ancient hygrometer was made.
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