Temperature Humidity
Todays deals on Temperature Humidity?
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1500 PCS DHT11 Digital Temperature and Humidity Sensor $2,179.99 |
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Foxboro Chart Recorder Temperature/Humidity 12R-PM2F (? $1,995.00 |
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NEW VAISALA HMT333 SERIES HMT330 HUMIDITY AND TEMPERATURE TRANSMITTER HUMICAP $1,536.99 |
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Handheld 6Channel Particle Counter IR & Air Temperature Dew Humidity Camera 4in1 $1,445.00 |
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Jumbo Display Data Logging LED Temperature/Humidity $1,307.99 |
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VAISALA HMP233A1C0A2EE12A1A3B HUMIDITY AND TEMPERATURE TRANSMITTER NIB $1,250.00 |
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Jumbo Display Data Logging LED Temperature/Humidity $1,178.99 |
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HONEYWELL IACD DR4200-GP2 CIRCULAR CHART RECORDER / TEMPERATURE-HUMIDITY $1,124.99 |
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GENERAL LRTH185DL1 -TEMPERATURE HUMIDITY MONITOR $979.99 |
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Kanomax 1512, Air Velocity, Temperature And Humidity Module for 1550/1560 $935.00 |
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ROTRONIC HYGROFLEX 3 HYGROFLEX-3 HUMIDITY/TEMPERATURE TRANSMITTER $895.00 |
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Testo 0572 1767, 176 P1 5-Channel Pressure, Temperature and Humidity Data Logger $798.00 |
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1 NEW VAISALA HMP233 HUMIDITY AND TEMPERATURE TRANSMITTER Q4-5 $750.00 |
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Comark N8004, 3060110 Temperature/Humidity Tester W/Probe & Flexible Lead $745.00 |
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COMARK N8006, 3060110 Temperature/Humidity Tester W/Probe & Flexible Lead $746.00 |
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DICKSON TH805 TEMPERATURE AND HUMIDITY RECORDER $715.00 |
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VAISALA HMP231 HUMIDITY/TEMPERATURE TRANSMITTER NIB!!! $725.00 |
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TES 1362 Printing Humidity / Temperature Meter TES1362 $709.00 |
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Testo 0572 1766, 176 H2 4-Channel Temperature and Humidity Data Logger $708.00 |
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VAISALA HUMIDITY AND TEMPERATURE TRANSMITTER HMW70Y *NEW IN BOX* $700.00 |
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VAISALA HMT325 HUMIDITY/TEMPERATURE TRANSMITTER ***NIB*** $679.00 |
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TES 1362 Printing Humidity / Temperature Meter TES1362 $666.46 |
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TES 1362 Printing Humidity / Temperature Meter TES1362 $633.14 |
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New TES 1362 Printing Humidity / Temperature Meter $645.00 |
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Testo 0572 1765, 176 H1 4-Channel Temperature and Humidity Data Logger $633.00 |
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TES1370 NDIR CO2 Analyzer Temperature Humidity Meter $579.99 |
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TES1370 NDIR CO2 Analyzer Temperature Humidity Meter $579.99 |
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TES1370 NDIR CO2 Analyzer Temperature Humidity Meter $579.99 |
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TES1370 NDIR CO2 Analyzer Temperature Humidity Meter $549.00 |
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TES1370 CO2 Analyzer Temperature Humidity Meter $549.00 |
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TES1370 NDIR CO2 Analyzer Temperature Humidity Meter Carbon Dioxide Tester,NEW $499.00 |
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Honeywell Circular Chart Recorder Humidity Temperature BRAND NEW $524.96 |
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VAISALA HMP131Y HUMIDITY/TEMPERATURE PROBE NIB!!! $525.00 |
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TES 1365 Datalogging Humidity/Temperature Meter TES1365 $487.00 |
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Reed THR-1, Temperature/Humidity Recorder, 7 Day $490.00 |
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Reed THR-2, Temperature/Humidity Recorder, 1 Day $490.00 |
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Miller-Nelson HCS-301 Temperature/Humidity Controller $498.44 |
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4150F Temperature & Relative Humidity indicator xmtr $495.00 |
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TES 1365 Datalogging Humidity/Temperature Meter TES1365 $457.78 |
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TES 1365 Datalogging Humidity/Temperature Meter TES1365 $434.89 |
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TSI 8705 HUMIDITY & TEMPERATURE PROBE & MONITOR W/ OMEGA 871 THERMOMETER *XLNT* $399.00 |
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Extech SD800 CO2/Humidity/Temperature Datalogger $399.99 |
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GENERAL CDM77232 – TEMPERATURE HUMIDITY IAQ MONITOR $395.95 |
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FOXBORO M/12R TEMPERATURE REL HUMIDITY CHART RECORDER $349.99 |
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TES 1361C Datalogging Humidity / Temperature Meter NEW $371.00 |
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Dickson TM725 Temperature and Humidity Ethernet Logger – Calibrated $350.00 |
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Testo 0572 1754, 175 H1 2-Channel Temperature and Humidity Data Logger $361.00 |
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Omega CT485B Temperature & Humidity Chart Recorder $337.50 |
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TES 1361C Datalogging Humidity / Temperature Meter NEW $348.74 |
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Dickson FH125 Temperature Humidity Recorder Lcd Display Graphing Logger $349 ea $349.99 |
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Hioki LR5001-20, Temperature and Humidity Logger $350.00 |
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FOGSTAT MEE Industries industrial humidity / temperature / fog controller $225.00 |
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TES 1361C Datalogging Humidity / Temperature Meter NEW $331.30 |
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New TES 1361C Datalogging Humidity / Temperature Meter $346.00 |
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B & K 725 Humidity/Temperature Meter/Data Logger. New. FREE SHIPPING!! $345.00 |
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Brand New FLUKE 971 Temperature Humidity Meter Psychrometer EMH017 $301.24 |
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Temperature/Humidity Monitor Data Logger $337.99 |
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Extech SD700 Barometric Pressure/Humidity/Temperature D $329.99 |
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NEW Testo 623 Temp Temperature Humidity Datalogger Data Logger Record Meter Test $310.00 |
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Omega Temperature Humidity Chart Recorder CT485-PS/N $309.28 |
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*NEW* Fluke 971 Temperature Humidity Meter Psychrometer $320.00 |
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NEW Fluke 971 Temperature Humidity Meter Psychrometer $320.00 |
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Vaisala HMT336 Series Humidity and Temperature Transmitters $299.99 |
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Psychron Model 566 TEMPERATURE & HUMIDITY ASPIRATED (Used) $299.00 |
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Omega RH71 Digital Hygro-Thermometer Temperature Relative Humidity $295.00 |
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*NEW* Fluke 971 Temperature Humidity Meter Psychrometer $304.89 |
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Omega DP25-E-GN Temperature Process Controller w/ Rotronic Humidity Transmitter $289.00 |
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Comark N2013, 3060058 Logger, Temperature, Humidity & Lcd Display $290.00 |
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Fluke 971 Temperature Humidity Meter Tester Psychrometer 99 Record Capacity $280.00 |
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Sato SK L200TH II Humidity and Temperature Data Logger $233.00 |
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TES 1364 Datalogging Humidity/Temperature Meter TES1364 $263.00 |
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Eliwell EWHS Type 31 Humidity & Temperature Transmitter Model 67000-318 New !!! $275.00 |
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Extech SD700 Barometric Pressure/Humidity/Temperature Datalogger with SD Card $269.99 |
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Extech RH520A Humidity+Temperature Chart Recorder with $269.99 |
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Extech RH520A-220 Humidity+Temperature Chart Recorder w $269.99 |
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Extech RH520A-240 Humidity+Temperature Chart Recorder w $269.99 |
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Reed SD-3007, Temperature/Humidity Meter $254.00 |
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TES 1364 Datalogging Humidity/Temperature Meter TES1364 $247.22 |
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FLUKE 971 TEMPERATURE HUMIDITY METER BRAND NEW SEALED $245.00 |
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37000-00 TEMPERATURE HUMIDITY AIR VELOCITY METER NEW $239.99 |
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TES 1364 Datalogging Humidity/Temperature Meter TES1364 $234.86 |
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GENERAL LTH8809DL – DATA LOGGING TEMPERATURE HUMIDITY $248.95 |
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VAISALA HUMIDITY AND TEMPERATURE TRANSMITTER HMP233 $229.00 |
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◥◣OMEGA TEMPERATURE HUMIDITY DATA LOGGER RH32B-C4◢◤ $224.95 |
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Extech SD500 Humidity/Temperature Datalogger $229.99 |
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Omega Temperature Humidity Chart Recorder CT-424-7 $214.73 |
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FLUKE 971 TEMPERATURE HUMIDITY METER $170.00 |
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HMI38 Humidity Data Processor & HMP35E Humidity and Temperature Probes $199.99 |
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DT-616CT Humidity & Temperature Meters -50℃~500℃ $219.98 |
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Testo 410-2 Digital Vane Anemometer Air Speed Temperature Humidity Meter Tester $219.90 |
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Testo 410-2 Digital Vane Anemometer Air Speed Temperature Humidity Meter Tester $218.68 |
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VAISALA HMD70Y HUMIDITY AND TEMPERATURE TRASMITTER *NEW OUT OF A BOX* $215.00 |
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Omega RH71 Digital Hygro-Thermometer Temperature Relative Humidity RH Dewpoint $214.99 |
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125 PCS DHT11 Digital Temperature and Humidity Sensor $212.00 |
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Carbon Dioxide CO2 Monitor 0-9999ppm Temperature -5-50C Humidity 3in1 Detector $172.00 |
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125 PCS DHT11 Digital Temperature and Humidity Sensor $209.59 |
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125 PCS DHT11 Digital Temperature and Humidity Sensor $207.99 |
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USB Temperature & Humidity Data Logger W/ Display & IRT $206.99 |
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Extech SD500 Humidity/Temperature Datalogger with SD Card $206.99 |
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CooperAtkins SRH77A Temperature / Humidity tester meter (BRAND NEW IN BOX) $205.00 |
Temperature Humidity Questions
How Humidity Affects our Lives
A largely invisible yet tangible phenomenon, humidity is one of those “necessary evils” that help form our beautiful and balanced environment. In all outward appearance, humidity seems to do nothing but bad – turns everything green, attracts critters, refuses to let your sweat evaporate, rots out wood, etc. Well, let’s take a look into this sinister element of nature and see if we can’t understand it better – sweat, mildew, termites and all.
Absolute Humidity, Specific Humidity, and Relative Humidity
These terms might be familiar to you, but let’s go over them in case. Absolute humidity and specific humidity are quite similar in concept, with the former being a ratio of water weight per unit of volume – typically grams per cubic meter – and the latter being a ratio of water weight per unit of weight – typically kilogram per kilogram.
If you were to condense all the moisture in a given volume of air – say a cubic meter – the ratio of water per cubic meter is its absolute humidity. Because absolute humidity changes with temperature and pressure, it can cause confusion in more complex fields such as chemical engineering, and is therefore rarely used (in these fields). For this reason – and to distinguish it from specific humidity – it is also sometimes referred to as volumetric humidity.
Relative humidity is what most of us are more familiar with, and it is the ratio – expressed as a percentage – of existing water vapor to the maximum water vapor the air is able to hold without condensing. Percentage indicates relative humidity, whereas other ratios such as those shown above are used for other humidity units.
Dew Point Vs. Relative Humidity
This is yet another phenomenon that is related to humidity. Dew is essentially condensation, and being that condensation is the saturation of air due to temperature-change, this temperature-change is also what causes dew to form. Condensation is essentially the bringing of water vapor to dew point via the lowering of temperature. The dew point is the temperature at which water vapor will begin condensing into water.
So how is dew point and relative humidity related? Well, as the relative humidity gets higher (percentage), the closer the dew point gets to the current air temperature. In other words, maximum relative humidity – 100% – means that the current air temperature is at the dew point. The lower the relative humidity at a given temperature, the more the temperature needs to decrease in order to reach its dew point.
There is a simple equation to calculate the dew point – if you need it – as long as the relative humidity is 50% or more. This should get you pretty accurate results – within ±1°C. The equation is as follows: Td = T-((100-RH)/5), where Td is the dew point, T is the temperature, and RH is relative humidity. You can also calculate relative humidity with the inverse: RH = 100-5(T-Td).
So now that we somewhat understand how humidity runs her business, we can take precautions to avoid suffering adversely at her hands. Why does a mattress get damp after sleeping on it directly on a cold floor? Why do closet walls (and everything between them) with no ventilation get moldy during the monsoon? Same reason dude! – Relative humidity and dew point working together to slip you a fast one.
But look on the bright side. – It makes you appreciate the good in life. Plus, not enough humidity is a problem as well. Here in Japan, people have to sometimes use dehumidifiers, but in other drier regions and countries people even have to use humidifiers in order to maintain a suitable environment for things such as musical instruments and certain precision products that would otherwise get damaged by the lack of humidity in the air. Goes both ways!
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