Non Contact
Non Contact
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2in1 Digital LASER Photo Non Contact Tachometer Tester |  |
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US $42.53 | 15m |
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Non Contact Digital LCD IR Infrared Thermometer Gun Red | |
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US $28.14 | 35m |
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250V AC Momentary Contact Non locking Pushbutton Switch | |
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US $4.36 | 39m |
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Non Contact IR Infrared Digital Thermometer 58 716°F °C | |
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US $19.90 | 40m |
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Non Contact IR Infrared Digital Thermometer 520Battery | |
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US $32.89 | 1h 3m |
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TWO NEW MINI NON CONTACT INFRARED THERMOMETER AUTO TEMP | |
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US $39.90 | 1h 37m |
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Non Contact IR Laser Infrared Digital Thermometer NEW | |
0 Bid | US $.99 | 1h 39m |
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Fieldpiece SNCV1 Pocket Non Contact Voltage Sensor | |
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US $14.88 | 1h 45m |
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2in1 Digital Contact Non contact Laser Tachometer ft m min Auto Ranging | |
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US $26.50 | 1h 55m |
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NEW Voltage Detector Non Contact Greenlee Ea Greenlee Specialty Tools acces | |
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US $29.45 | 2h 16m |
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Harbor Freight COUPON NON CONTACT INFRARED THERMOMETER W LASER 9V DC BAT INC | |
5 Bids | US $8.50 | 2h 24m |
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NEW DIGITAL WINE THERMOMETER NON CONTACT AMBIENT BOTTLE TEMPERATURE CALCULATOR | |
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US $12.95 | 2h 50m |
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Multimeter 600V AC DC Non Contact Voltage detector NEW Pocket sized | |
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US $35.00 | 2h 57m |
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Klein Tools NCVT 2 Dual Range Non Contact Voltage Tester | |
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US $18.90 | 3h 3m |
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Infrared IR Laser Non Contact Digital Thermometer °C °F | |
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US $37.46 | 3h 21m |
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Raytek Raynger Infrared pistol thermometer for non contact temp measurement | |
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US $75.00 | 3h 41m |
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NON CONTACT IR LASER TEMPERATURE GUN INFRARED DIGITAL THERMOMETER SIGHT HANDHELD | |
0 Bid | US $18.95 | 4h 37m |
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EXTECH 381676 Pen DMM w Non Contact Voltage Detector | |
0 Bid | US $38.99 | 5h 19m |
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IR 42530 Wide Range Non Contact Thermometer | |
0 Bid | US $25.00 | 5h 32m |
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Non Contact Infrared Thermometer Gun Shape Laser Point | |
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US $92.79 | 5h 59m |
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New Infrared IR Laser Point Non Contact Digital Thermometer Gun w 9V battery | |
0 Bid | US $20.99 | 6h 1m |
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Klein NCVT 1 NON CONTACT VOLTAGE TESTER | |
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US $21.59 | 6h 17m |
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Kidz Med VeraTemp Non Contact Thermometer | |
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US $59.10 | 6h 45m |
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Norgren QM 32 2 240V AC DC LED Non Contact Reed Switch | |
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US $38.50 | 6h 47m |
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Sperry VD6505 Adjustable Non Contact Volt Sensor 12 1000V AC | |
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US $22.48 | 6h 50m |
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Non Contact IR Infrared Laser Point Digital Thermometer | |
0 Bid | US $.01 | 6h 56m |
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Non Contact Digital Infrared Thermometer | |
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US $49.95 | 7h 6m |
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Non contact Digital Infrared Body Thermometer 32 43C C | |
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US $20.39 | 7h 8m |
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Non Contact IR Infrared Digital Thermometer with Laser 9V Battery US Shipping | |
1 Bid | US $24.95 | 7h 9m |
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Digital Laser Photo Non Contact Tachometer RPM Test | |
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US $13.50 | 7h 46m |
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New Laser Photo Auto Tachometer Non Contact RPM Meter | |
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US $26.49 | 7h 53m |
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TN205L Non Contact IR Infrared Thermometer for Home Shop or Hobby FULL WARRANTY | |
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US $59.00 | 7h 54m |
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EXTECH DV30 Non Contact AC Voltage Detector 12 600V | |
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US $14.99 | 7h 58m |
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TN40ALC Professional Non Contact IR Laser Thermometer w FULL WARRANTY | |
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US $199.00 | 8h 7m |
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TOPCON CT 80 NON CONTACT TONOMETER | |
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US $4,900.00 | 8h 12m |
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Infrared IR Laser Non Contact Digital Thermometer Gun C | |
0 Bid | US $22.99 | 8h 27m |
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Premium Fleece NON SLIP Close Contact Saddle Pad White | |
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US $26.50 | 8h 30m |
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Extech IR Non Contact Thermometer IR400 Laser Backlight NEW sim2 Fluke | |
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US $39.95 | 9h 27m |
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DIGITAL LASER PHOTO TACHOMETER NON CONTACT TACH RPM | |
0 Bid | US $37.99 | 9h 40m |
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BELL mA 2000 DC TRUE RMS AC NON CONTACT MILLIAMMETER | |
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US $960.00 | 9h 50m |
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New LCD Digital Laser Non Contact Photo Tachometer Tach | |
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US $25.60 | 10h 45m |
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Non contact Infrared Body Thermometer 32C 43C | |
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US $13.99 | 11h 25m |
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Shimpo DT209X Laser Non Contact Contact Digital Tachometer LCD Display | |
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US $357.20 | 11h 26m |
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Infrared IR Laser Non Contact Thermometer XC XF B334 | |
0 Bid | US $33.70 | 11h 44m |
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WILMAR NON CONTACT INFRARED THERMOMETER W89720 | |
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US $49.09 | 12h |
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Infrared IR Laser Non Contact Thermometer XC XF G334 | |
0 Bid | US $33.70 | 12h 14m |
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Corvette 1963 1966 Horn Contact Spring non tele E10650 | |
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US $16.99 | 12h 19m |
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Non Contact Pocket Laser Infrared Digital Thermometer | |
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US $15.99 | 12h 20m |
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GREENLEE NON CONTACT VOLTAGE DETECTOR GT 11 1000 VAC CAT IV | |
12 Bids | US $16.55 | 12h 22m |
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Laser Non Contact Infrared IR Digital LCD Thermometer | |
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US $15.99 | 12h 28m |
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KINTREX IRT0421 Non Contact Infrared Thermometer NEW | |
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US $56.99 | 13h 5m |
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Uni T UT12A Non contact AC Voltage Detector 90 1000V | |
0 Bid | US $9.99 | 13h 12m |
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STANLEY NON CONTACT INFRARED THERMOMETER W LASER TARGETING | |
0 Bid | US $10.00 | 13h 52m |
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Minolta Vivid 300 Non Contact 3D Digitizer | |
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US $950.00 | 13h 55m |
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Non Contact IR Laser Infrared Digital Thermometer GM300 50°C 380°C 121 NEW | |
0 Bid | US $.01 | 13h 56m |
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Mini Non Contact Infrared Thermometer DT 300 Black New | |
0 Bid | US $.01 | 14h 33m |
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Non Contact AC Voltage Detector 90 1000V Tester Pen New | |
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US $4.63 | 14h 35m |
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Voltage Detector Tester Pen Non Contact Probe Pen | |
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US $2.70 | 15h 5m |
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Non Contact IR Infrared Digital Thermometer Laser Point Gun GM380 50ºC 380ºC N | |
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US $19.36 | 15h 23m |
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New Infrared Laser Point Non Contact Digital Thermometer Gun US | |
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US $27.89 | 15h 23m |
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Non Contact IR Infrared Digital Thermometer Laser Point Gun GM550 50ºC 550ºC N | |
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US $22.52 | 15h 31m |
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NEW DIGITAL NON CONTACT LASER PHOTO TACHOMETER TACH RPM | |
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US $42.53 | 15h 35m |
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Non Contact IR Laser Infrared Digital Thermometer Gun 50ºC 700ºC Scan Function N | |
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US $35.88 | 15h 36m |
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Non Contact IR Laser Infrared Digital Thermometer Gun 50ºC 900ºC Scan Function N | |
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US $54.98 | 15h 40m |
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Non Contact IR Infrared Digital Temperature Thermometer | |
0 Bid | US $.90 | 15h 48m |
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Klein Tools Non Contact Voltage Tester | |
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US $11.99 | 15h 52m |
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Infrared IR Laser Non Contact Digital Thermometer Gun 58 896°F °C 121 DS | |
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US $35.90 | 16h 5m |
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Non Contact IR Infrared Digital Thermometer 58 716 °F | |
1 Bid | US $18.80 | 16h 16m |
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CEN TECH NON CONTACT LCD DIGITAL POCKET THERMOMETER INSTANT TEMPERATURE READING | |
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US $19.99 | 16h 22m |
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Digital Non Contact Surface RPM Meter Tachometer | |
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US $34.99 | 16h 26m |
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Pen Style Non Contact AC Electric Voltage Detector Sensor Tester 90V 1000V with | |
0 Bid | US $.99 | 16h 33m |
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New Non Contact Voltage Detector 90 1000V AC Pen Tester | |
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US $5.75 | 16h 50m |
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Non Contact IR Infrared Digital Thermometer Laser Point Gun DT8380 Hight Quality | |
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US $18.62 | 16h 50m |
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Digital Non Contact Infrared Thermometer 25 560°C °F | |
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US $35.90 | 16h 55m |
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Non Contact LCD IR Infrared Pocket Digital Thermometer Mini Red Hight Quality | |
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US $11.52 | 16h 58m |
What is the best type of non prescription color contact lens brand/ website?
I want to get long-lasting color contacts.
I have 20-20 vision so they need to be non-prescription.
Preferably under 30 dollars.
Also it'd be great if i didnt have to go through my eye doctor to get them.
One more thing, I have light blue eyes.
http://cosmeticlenses.co.uk
Contact And Non-Contact Varieties Of Temperature Sensors
Generally temperature sensors fall into two distinct categories, defined as contact and non-contact. It must be remembered that sensors and particularly those that measure temperature inherently have problems with accuracy. What is important to recognise is that the discrepancy estimates should be accurate and many readings should be made in order for the final results to have decent levels of accuracy.
Part of this is to calibrate your temperature sensors whether they are contact or non-contact with a known temperature, by doing this you can minimise any discrepancies in the readings, making your measurement extremely accurate; this process is fundamentally important before any measurement can take place.
Contact temperature sensors essentially measure their own temperature at any given time. They do this by creating a thermal equilibrium between the sensor and the substance being measured. Thermal equilibrium simply means that the two bodies have no heat flowing between them and are hence the same temperature. There are however a variety of errors that can occur when using these types of sensors, for instance surfaces are especially hard to measure with contact sensors, in such instances a non-contact method is more avoidable.
Contact sensors are by far the norm for temperature measurement in science and industry. Types of contact sensor include thermocouples and thermometers. Thermocouples use an electrical current with specific resistance levels that through variations of this resistance can measure temperature; this is widely termed the Seebeck effect. Out of the temperature sensors utilised in science and industry thermocouples are some of the most widely used due to their ease of operation, relative inexpensiveness and their ability to measure across a wide spectrum.
Thermometers as a means of measuring temperature differ greatly, not only in terms of accuracy but in terms of operation. Of course there is the most widely used sensor in the world the liquid glass thermometer; the one that measured your fever when you were a child. As well as these however there are filled system thermometers used in ovens to regulate cooking temperatures as well as bimetallic thermometers that have two metals contained within them that measure at different rates. However there is no need to use an expensive thermometer, it is even possible to measure temperature with the use of materials that change state at certain temperatures, scientifically these are known as phase change devices.
Less widespread is the use of non-contact sensors, as a result the manufacture and use of these devices is less standardised than the contact type. The situation is changing however; in the medical profession the use of the infra red ear thermometer is becoming extensive as a more efficient and effective way of gaining patient temperatures. The lack of standardisation of other forms of non-contact sensors has meant that they are struggling to be utilised across a wide variety of industry sectors.
Fundamentally they work on the principles of Plank's law; that is the thermal emission of radiation, although the names given to this type of sensors are extremely varied, adding to the confusion that surrounds their usage. Names such as pyrometer, radiometer and thermal imager are most common but are in no way a comprehensive list for this type of temperature sensor.
Today temperature sensors are used in all manner of industries and professions. Naturally the medical profession uses both varieties of sensor extensively but those in the manufacturing of foodstuffs such as the fermenting process as well as the manufacture of goods also use thermal measurement regularly. The large number of different varieties stands testament to the importance of this piece of equipment in the world currently, fundamental is that they should be calibrated so that accurate measurements can be made.
About the Author
Equipment expert Thomas Pretty looks into the different types of temperature sensors and the industries that use them.
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