Non Contact
Non Contact
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Digital Laser Non Contact Photo Tachometer RPM Tester |  |
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US $17.99 | 18m |
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Reichert XPERT NCT Plus non contact tonometer 12450 | |
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US $1,400.00 | 19m |
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Non Contact IR Laser Infrared Digital Thermometer NEW | |
0 Bid | US $.99 | 53m |
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Non Contact Infrared Digital Thermometer LCD Display | |
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US $29.99 | 1h 11m |
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Zadro THE01 Multi Scan Non Contact Infrared Thermometer | |
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US $49.99 | 1h 15m |
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Digital Laser Photo Non Contact Tachometer RPM Tester | |
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US $9.90 | 1h 58m |
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Non Contact IR Infrared Laser Point Digital Thermometer | |
0 Bid | US $.01 | 2h 16m |
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Non Contact IR Infrared Digital Thermometer Laser Point | |
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US $22.79 | 2h 46m |
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TWO NEW MINI NON CONTACT INFRARED THERMOMETER AUTO TEMP | |
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US $39.90 | 2h 57m |
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Compact Non Contact Infrared IR Thermometer 45096 NIB | |
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US $28.99 | 3h 35m |
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Non Contact Digital Thermometer Temperature 20 to 380C | |
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US $17.69 | 4h 5m |
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NEW DIGITAL NON CONTACT LASER PHOTO TACHOMETER TACH RPM | |
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US $34.99 | 4h 18m |
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New LCD Digital Laser Non Contact Photo Tachometer Tach | |
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US $17.16 | 4h 19m |
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Non Contact Pocket Laser Infrared IR Digital LCD Thermometer | |
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US $12.39 | 4h 20m |
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Greenlee 332 GT 12 Detector Voltage Non Contact Gt | |
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US $34.61 | 4h 35m |
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Non Contact Infrared Temperature Thermometer for HVAC | |
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US $17.69 | 5h 4m |
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Non Contact Laser Point Infrared IR Digital LCD Thermometer | |
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US $11.79 | 5h 31m |
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ROHTO Lycee EyeDrops Non Contact Lens US Seller NIB | |
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US $8.19 | 5h 33m |
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Kintrex IRT0421 Non Contact Infrared Thermometer with Laser Targeting | |
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US $49.95 | 5h 36m |
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Non Contact Digital LCD Infrared Thermometer 50 700C | |
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US $22.29 | 6h 22m |
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Phototach Contact Non Contact Tachometer OTC3665 BRAND NEW | |
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US $221.45 | 6h 31m |
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New GB Circuit Alert Non Contact Voltage Probe GVD 504AD Gardner Bender | |
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US $29.99 | 6h 32m |
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Craftsman Non Contact Voltage Current Detector 82147 New Sealed LOOK | |
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US $17.99 | 6h 34m |
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Infrared IR Laser Non Contact Thermometer XC XF P334 | |
0 Bid | US $33.70 | 6h 58m |
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Non Contact Infrared Thermometer Temperature Laser Gun | |
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US $74.96 | 7h 5m |
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MARINE PART LED BULB DOUBLE CONTACT NON PARALLEL PINS | |
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US $24.00 | 7h 36m |
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Amprobe 5XP A Compact DMM with Non Contact Voltage | |
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US $42.46 | 7h 47m |
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Taylor Thermometer 9524 Non contact Infrared Laser Digital Cooking | |
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US $60.00 | 8h 35m |
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Non Contact IR Infrared Digital Temperature Temp Thermometer Laser Point Measure | |
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US $23.02 | 8h 40m |
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NON CONTACT IR LASER TEMPERATURE GUN INFRARED DIGITAL THERMOMETER SIGHT HANDHELD | |
1 Bid | US $18.95 | 9h 32m |
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Non Contact AC Voltage Pen Detector Tester Meter 250V | |
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US $6.99 | 9h 35m |
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BLACK DECKER INFRARED NON CONTACT THERMAL LEAK DETECTOR GUN TLD100 CUT ENERGY | |
0 Bid | US $32.99 | 9h 48m |
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Mini Non Contact Infrared Thermometer DT 300 Black New | |
0 Bid | US $.01 | 9h 55m |
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OMEGA OS65 MA1 R5 3 Non Contact Infrared Pyrometer | |
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US $349.00 | 9h 56m |
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Non Contact Digital Temperature Infrared Thermometer R | |
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US $12.56 | 10h 12m |
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Valentine Gift Non Contact IR Infrared Digital Thermometer w Laser 9V Battery | |
0 Bid | US $14.95 | 10h 27m |
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Klein NCVT 2 Dual Range Non Contact Voltage Tester | |
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US $18.99 | 11h 3m |
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Uni T Prof Infrared IR Thermometers Non contact UT301A | |
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US $64.99 | 11h 9m |
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Non Contact LCD IR Infrared Pocket Digital Thermometer | |
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US $10.19 | 11h 18m |
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ETCR1000A Non Contact 3 Phase Rotation Tester Indicator | |
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US $96.99 | 11h 19m |
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ETCR1000 Non Contact 3 Phase Rotation Tester Indicator | |
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US $96.99 | 11h 19m |
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Digital LCD Infrared IR Non Contact Thermometer Black | |
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US $10.29 | 11h 23m |
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Infrared IR 121 DS Laser Non Contact Digital Thermometer 50 480°C 58 896°F | |
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US $33.99 | 11h 24m |
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Pen Style Non Contact AC Electric Voltage Detector Sensor Tester 90V 1000V with | |
0 Bid | US $.99 | 11h 52m |
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Non Contact IR Infrared LCD Digital Thermometer Pocket | |
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US $12.54 | 11h 53m |
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Non Contact Mini Infrared Thermometer Laser 40 932°F | |
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US $36.90 | 12h 6m |
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Mini Non Contact IR Infrared Digital Pen Thermometer | |
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US $7.99 | 12h 9m |
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Non Contact IR Infrared Thermometer Laser Point GM550 50 550°C 121 yellow | |
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US $18.87 | 12h 25m |
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Non Contact IR Diode Laser Gun Infrared Digital Thermometer Body Thermometers | |
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US $25.99 | 12h 26m |
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KINTREX Non Contact Infrared Laser Target Thermometer | |
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US $59.95 | 12h 54m |
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INFRARED IR TALKING DIGITAL THERMOMETER New Non contact point like gun digital | |
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US $38.97 | 12h 59m |
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Laser Non Contact Infrared IR Digital LCD Thermometer | |
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US $15.19 | 13h 2m |
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NEW Non Contact Voltage Detector Pen Style 70 1000 Volts batteries incl low | |
1 Bid | US $1.25 | 13h 5m |
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NON CONTACT INFRARED THERMOMETER TADD | |
3 Bids | US $7.50 | 13h 23m |
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FREE SHIPPING Mini Non Contact IR Infrared Digital Thermometer DT 8260 RED | |
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US $19.88 | 13h 25m |
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DT 8530 Non Contact IR Infrared Digital Thermometer with Laser Gun LCD | |
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US $32.58 | 13h 25m |
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Infrared IR Laser Non Contact Digital Thermometer 50 280°C 58 572°F 121DS | |
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US $19.90 | 14h 25m |
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Non Contact IR Laser Infrared Digital Thermometer GM300 50°C 380°C 121 NEW | |
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US $13.91 | 15h 34m |
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Non Contact IR Laser Infrared Digital Thermometer 50°C 700°C 121 GM700 POINT | |
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US $27.96 | 15h 35m |
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Mini Non Contact IR Infrared LCD Digital Thermometer 50ºC to 300ºC DT 300 Red | |
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US $12.99 | 16h 3m |
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Non Contact IR Diode Laser Gun Infrared Digital Thermometer for Baby Adult | |
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US $25.99 | 16h 7m |
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NewInfrared IR Laser Non Contact Digital Thermometer | |
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US $520.96 | 16h 12m |
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Non Contact Voltage Detector Tester Pen Alert 600V AC | |
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US $1.08 | 16h 12m |
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Non Contact IR Laser Infrared Digital Thermometer DT380 | |
1 Bid | US $.01 | 16h 15m |
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NON CONTACT IR LASER INFRARED DIGITAL THERMOMETER NEW | |
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US $520.96 | 16h 31m |
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Non Contact IR Infrared Digital Thermometer with Laser | |
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US $20.99 | 16h 40m |
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Pocket Infrared Non Contact LCD Digital Thermometer | |
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US $16.99 | 16h 40m |
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New MASTECH MS8900 Non contact 100V 240V AC Voltage Detector Sensor Tester Pen | |
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US $7.53 | 16h 50m |
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Black Non Contact IR Infrared Digital Thermometer Industrial Test Emissivity095 | |
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US $12.99 | 17h 8m |
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Black Non Contact IR Infrared Digital Thermometer Industrial Test Date Hold | |
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US $12.99 | 17h 12m |
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Black Non Contact IR Infrared Digital Thermometer ℃ ℉ HomeGarden Test Date Hold | |
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US $12.99 | 17h 17m |
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Black Non Contact Infra Red Digital Thermometer ℃ ℉ HomeGarden Test 50ºC 300ºC | |
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US $12.99 | 17h 20m |
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Professional Non Contact Digital IR Thermometer Laser | |
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US $35.90 | 17h 55m |
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FS 700 INFRARED NON CONTACT THERMOMETER temperature | |
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US $91.10 | 18h 2m |
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Infrared IR Non Contact Pocket Digital Thermometer | |
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US $14.75 | 18h 23m |
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Digital Laser Photo Tachometer Non Contact Tach RPM B | |
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US $14.38 | 18h 27m |
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Non Contact AC 90 1000V Voltage Detector Pen Tester | |
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US $3.54 | 19h 32m |
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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