Shipping all over India

Warranty & Service

100% Secure Payment

Frequently Asked Questions

  • Home
  • Frequently Asked Questions
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Alloys:
Alloy 24ST, polished 75 24 0.90
Alloy 75ST 75 24 0.11
20-Ni, 25-Cr, 55-Fe, oxidized 392 932 200 500 0.90 0.97
60-Ni, 12-Cr, 28-Fe, oxidized 518 1040 270 560 0.89 0.82
80-Ni, 20-Cr, oxidized 212 1112 2372 100 600 1300 0.87 0.87 0.89
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Aluminum:
Unoxidized 77 212 932 25 100 500 0.02 0.03 0.06
Oxidized 390 1110 199 599 0.11 0.19
Oxidized @1110°F 390 1110 199 599 0.11 0.19
Heavily oxidized 200 940 93 504 0.20 0.31
Highly polished 212 100 0.09
Roughly polished 212 100 0.18
Commercial sheet 212 100 0.09
Highly polished plate 440 1070 227 577 0.04 0.06
Bright rolled plate 338 932 170 500 0.04 0.05
Alloy A3003, oxidized 600 900 315 482 0.40 0.40
Alloy 1100-0 200 to 800 93 to 427 0.05
Alloy 24ST 75 24 0.09
Alloy 24ST, polished 75 24 0.09
Alloy 75ST 75 24 0.11
Alloy 75ST, polished 75 24 0.08
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Asphalt:
Pavement 100 38 0.93
Tar paper 68 20 0.93
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Basalt 68 20 0.72
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Bismuth:
Bright 176 80 0.34
Unoxidized 77 212 25 100 0.05 0.06
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Brass:
Matte 68 20 0.07
Burnished to brown color 68 20 0.40
Cu-Zn, brass oxidized 392 752 1112 200 400 600 0.61 0.60 0.61
Unoxidized 77 25 0.04
Unoxidized 212 100 0.04
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Brick:
Red, rough 70 21 0.93
Gault cream 2500 to 5000 1371 to 2760 0.26 to 0.30
Fire clay 2500 1371 0.75
Light buff 1000 538 0.80
Lime clay 2500 1371 0.43
Fire brick 1832 1000 0.75 to 0.80
Magnesite, refractory 1832 1000 0.38
Gray brick 2012 1100 0.75
Silica, glazed 2000 1093 0.88
Silica, unglazed 2000 1093 0.80
Sandime 2500 to 5000 1371 to 2760 0.59 to 0.63
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Cadmium 77 25 0.02
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Carbon:
Lamp black 77 25 0.95
Unoxidized 77 25 0.81
Unoxidized 212 932 100 500 0.81 0.79
Candle soot 250 121 0.95
Filament 500 260 0.95
Graphitized 212 572 932 100 300 500 0.76 0.75 0.71
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Carborundum 1850 1010 0.92
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Cast iron:
Oxidized 390 1110 199 599 0.64 0.78
Unoxidized 212 100 0.21
Strong oxidation 104 482 40 250 0.95 0.95
Liquid 2795 1535 0.29
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Ceramic:
Alumina on Inconel 800 to 2000 427 to 1093 0.69 to 0.45
Earthenware, glazed 70 21 0.90
Earthenware, matte 70 21 0.93
Greens, No. 5210-2C 200 to 750 93 to 399 0.89 to 0.82
Coating, No. C20A 200 to 750 93 to 399 0.73 to 0.67
Porcelain 72 22 0.92
White, Al2O3 200 93 0.90
Zirconia on Inconel 800 to 2000 427 to 1093 0.62 to 0.45
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Chromium:
Chromium 100 1000 38 538 0.08 0.26
Chromium, polished 302 150 0.06
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Clay: 68 20 0.39
Fired 158 70 0.91
Shale 68 20 0.69
Tiles, light red 2500 to 5000 1371 to 2760 0.32 to 0.34
Tiles, red 2500 to 5000 1371 to 2760 0.40 to 0.51
Tiles, dark purple 2500 to 5000 1371 to 2760 0.78
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Columbium:
Unoxidized 1500 2000 816 1093 0.19 0.24
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Concrete:
Rough 32 to 200 0 to 93 0.94
Tiles, natural 2500 to 5000 1371 to 2760 0.63 to 0.62
Tiles, brown 2500 to 5000 1371 to 2760 0.87 to 0.83
Tiles, black 2500 to 5000 1371 to 2760 0.94 to 0.91
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Copper:
Black, oxidized 100 38 0.78
Etched 100 38 0.09
Matte 100 38 0.22
Roughly polished 100 38 0.07
Polished 100 38 0.03
Highly polished 100 38 0.02
Rolled 100 38 0.64
Rough 100 38 0.74
Molten 1000 1970 2230 538 108 1221 0.15 0.16 0.13
Nickel plated 100 to 500 38 to 260 0.37
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Cotton cloth 68 20 0.77
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Dolomite lime 68 20 0.41
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Dow metal 0 to 600 -18 to 315 0.15
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Emery corundum 176 80 0.86
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Glass:
Convex D 212 600 932 100 315 500 0.80 0.80 0.76
Nonex 212 600 932 100 315 500 0.82 0.82 0.78
Smooth 32 to 200 0 to 93 0.92 to 0.94
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Gold:
Enamel 212 100 0.37
Plate (0.001) on 0.0005 silver 200 to 750 93 to 399 0.11 to 0.14
Plate (0.001) on 0.005 nickel 200 to 750 93 to 399 0.07 to 0.09
Polished 100 to 500 1000 to 2000 38 to 260 538 to 1093 0.02 0.03
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Granite 70 21 0.45
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Gravel 100 38 0.28
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Gypsum 68 20 0.80 to 0.90
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Haynes Alloy C., oxidized 600 to 2000 316 to 1093 0.90 to 0.96
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Haynes Alloy 25, oxidized 600 to 2000 316 to 1093 0.86 to 0.89
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Haynes Alloy X., oxidized 600 to 2000 316 to 1093 0.85 to 0.88
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Ice:
Smooth 32 0 0.97
Rough 32 0 0.98
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Inconel:
Sheet 1000 1200 1400 538 649 760 0.28 0.42 0.58
Inconel X, polished 75 24 0.19
Inconel B, polished 75 24 0.21
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Iron:
Oxidized 212 930 2190 100 499 1199 0.74 0.89 0.89
Unoxidized 212 100 0.05
Red rust 77 25 0.70
Rusted 77 25 0.65
Liquid 2760 to 3220 1516 to 1771 0.42 to 0.45
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Lacquer:
Black 200 93 0.96
Blue, on aluminum foil 100 38 0.78
Clear, on aluminum foil, 2 coats 200 93 0.08 (0.09)
Clear, on bright copper 200 93 0.66
Clear, on tarnished copper 200 93 0.64
Red, on aluminum foil, 2 coats 100 38 0.61 (0.74)
White, on aluminum foil, 2 coats 100 38 0.69 (0.88)
White 200 93 0.95
Yellow, on aluminum foil, 2 coats 100 38 0.57 (0.79)
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Lead:
Polished 100 to 500 38 to 260 0.06 to 0.08
Rough 100 38 0.43
Oxidized 100 38 0.43
Oxidized @ 1100¡F 100 38 0.63
Oxidized, gray 100 38 0.28
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Lime mortar 100 to 500 38 to 260 0.90 to 0.92
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Limestone 100 38 0.95
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Magnesium 100 to 500 38 to 260 0.07 to 0.13
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Magnesium oxide 1800 to 3140 982 to 1727 0.16 to 0.20
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Marble:
White 100 38 0.95
Smooth 100 38 0.56
Polished gray 100 38 0.75
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Mercury 32 77 100 212 0 25 38 100 0.09 0.10 0.10 0.12
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Mica 100 38 0.75
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Oil on nickel:
0.001 film 72 22 0.27
0.002 film 72 22 0.46
0.005 film 72 22 0.72
Thick film 72 22 0.82
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Oil, linseed:
On aluminum foil, uncoated 250 121 0.09
On aluminum foil, 1 coat 250 121 0.56
On aluminum foil, 2 coats 250 121 0.51
On polished iron, 0.001 film 100 38 0.22
On polished iron, 0.002 film 100 38 0.45
On polished iron, 0.004 film 100 38 0.65
On polished iron, thick film 100 38 0.83
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Paints:
Blue, CO2O3 75 24 0.94
Black, CuO 75 24 0.96
Green, Cu2O3 75 24 0.92
Red, Fe2O3 75 24 0.91
White, Al2O3 75 24 0.94
White, Y2O3 75 24 0.90
White, ZnO 75 24 0.95
White, MgCO3 75 24 0.91
White, ZrO2 75 24 0.95
White, ThCO2 75 24 0.90
White, MgO 75 24 0.91
White, PbCO3 75 24 0.93
Yellow, PbO 75 24 0.90
Yellow, PbCrO4 75 24 0.93
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Paints, aluminum: 100 38 0.27 to 0.67
10% Al 100 38 0.52
26% Al 100 38 0.30
DOW XP-310 200 93 0.22
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Paints, bronze: Low 0.34 to 0.80
Gum varnish, 2 coats 70 21 0.53
Gum varnish, 3 coats 70 21 0.50
Cellulose binder, 2 coats 70 21 0.34
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Paints, oil:
All colors 200 93 0.92 to 0.96
Black 200 93 0.92
Black gloss 70 21 0.90
Camouflage green 125 52 0.85
Flat black 80 27 0.88
Flat white 80 27 0.91
Gray green 70 21 0.95
Green 200 93 0.95
Lamp black 209 98 0.96
Red 200 93 0.95
White 200 93 0.94
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Palladium plate (0.00005) on 0.0005 silver 200 to 750 93 to 399 0.16 to 0.17
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Paper:
Kraft (average non-glass) — — 0.90
Offset (glass) — — 0.50 to 0.60
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Plastics (average) Low 0.95
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Platinum:
Platinum, black 100 500 2000 38 260 1093 0.93 0.96 0.97
Platinum, oxidized @ 1100°F 500 1000 260 538 0.07 0.11
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Quartz:
Rough, fused: 70 21 0.93
Glass, 1.98 mm 540 1540 282 838 0.90 0.41
Glass, 6.88 mm 540 1540 282 838 0.93 0.47
Opaque 570 1540 299 838 0.92 0.68
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Red lead 212 100 0.93
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Rhodium flash: 0.0002 on 0.0005 Ni 200 to 700 93 to 271 0.10 to 0.18
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Rubber:
Hard 74 23 0.94
Soft, gray 76 24 0.86
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Sand 68 20 0.76
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Sawdust 68 20 0.75
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Silica:
Glazed 1832 1000 0.85
Unglazed 2012 1100 0.75
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Silver:
Plate 0.0005 on nickel 200 to 700 93 to 271 0.06 to 0.07
Polished 100 500 1000 2000 38 260 538 1093 0.01 0.02 0.03 0.03
Slate 100 38 0.67 to 0.80
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Snow:
Fine particles 20 7 0.82
Granular 18 8 0.89
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Soil:
Surface 100 38 0.38
Black loam 68 20 0.66
Plowed field 68 20 0.38
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Steel:
Cold rolled 200 93 0.75 to 0.85
Ground sheet 1720 to 2010 938 to 1099 0.55 to 0.61
Polished sheet 100 500 1000 38 260 538 0.07 0.10 0.14
Mild steel, polished 75 24 0.10
Mild steel, smooth 75 24 0.12
Mile steel, liquid 2910 to 3270 1599 to 1799 0.28
Unoxidized 77 212 25 100 0.80 0.08
Oxidized 77 25 0.80
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Steel alloys:
Type 301, polished 75 450 1740 24 232 949 0.27 0.57 0.55
Type 303, oxidized 600 to 2000 316 to 1093 0.74 to 0.87
Type 310, rolled 1500 to 2100 816 to 1149 0.56 to 0.81
Type 316, polished 75 450 1740 24 232 949 0.28 0.57 0.66
Type 321 200 to 800 93 to 427 0.27 to 0.32
Type 321, polished 300 to 1500 149 to 816 0.18 to 0.49
Type 321, with black oxide 200 to 800 93 to 427 0.66 to 0.76
Type 347, oxidized 600 to 2000 316 to 1093 0.87 to 0.91
Type 350 200 to 800 93 to 427 0.18 to 0.27
Type 350, polished 300 to 1800 149 to 982 0.11 to 0.35
Type 446, polished 300 to 1500 419 to 816 0.15 to 0.37
Type 17-7PH 200 to 600 93 to 315 0.44 to 0.51
Type 17-7PH, polished 300 to 1500 149 to 816 0.09 to 0.16
Type C1020, oxidized 600 to 2000 316 to 1093 0.87 to 0.91
Type PH-15-7MO 300 to 1200 149 to 649 0.07 to 0.19
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Stellite, polished 68 20 0.18
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Stonework 100 38 0.93
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Tantalum:
Unoxidized 1340 2000 3600 5306 727 1093 1982 2930 0.14 0.19 0.26 0.30
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Tin:
Unoxidized 77 212 25 100 0.04 0.05
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Tinned iron:
Bright 76 212 24 100 0.05 0.08
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Titanium:
Alloy C110M, polished 300 to 1200 149 to 649 0.08 to 0.19
Alloy C110M, oxidized @ 1000°F 200 to 800 93 to 427 0.51 to 0.61
Alloy TI-95A, oxidized @ 1000°F 200 to 800 93 to 427 0.35 to 0.48
Anodized onto stainless steel 200 to 600 93 to 316 0.96 to 0.82
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Tungsten:
Unoxidized 77 212 932 1832 2732 3632 25 100 500 1000 1500 2000 0.02 0.03 0.07 0.15 0.23 0.28
Filament (aged) 100 1000 5000 38 538 2760 0.03 0.11 0.35
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Uranium oxide 1880 1027 0.79
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Water 100 38 0.93
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Wood: Low 0.80 to 0.90
Beech, planed 158 70 0.94
Oak, planed 100 38 0.91
Spruce, sanded 100 38 0.89
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Wrought iron:
Dull 77 660 25 349 0.94 0.94
Smooth 100 38 0.35
Polished 100 38 0.28
MATERIAL TEMPERATURE EMISSIVITY
°F °C
Zinc:
Bright galvanized 100 38 0.23
Commercial 99.1% 500 260 0.05
Galvanized 100 38 0.28
Oxidized 500 to 1000 260 to 538 0.11
Polished 100 500 1000 2000 38 260 538 1093 0.02 0.03 0.04 0.06
This is a function of the optics in your thermometer. Use the distance-to-sight ratio and the diameter of your target to determine the maximum distance you can be from the target. Most IR thermometers have a maximum measuring distance of approximately 100 feet (30 meters), depending on environmental conditions.

Targets as small as 0.017 inches can be measured. The limitation is the temperature and emissivity. As the temperature goes lower or the emissivity is lower, then the instrument cannot measure as the spot size becomes too small.

The response time of IR thermometers is faster than most thermometers; approximately 0.5 second.
Non-contact infrared (IR) thermometers use infrared technology to quickly and conveniently measure the surface temperature of objects. They provide fast temperature readings without having to physically touch the object. You simply aim, pull the trigger and read the temperature on the LCD display. Lightweight, compact, and easy-to-use, IR thermometers can safely measure hot, hazardous, or hard-to-reach surfaces without contaminating or damaging the object. Also, infrared thermometers can provide several readings per second, as compared to contact methods where each measurement can take several minutes.
Our full Product Catalogue is available for download on our website. You can view and download it at https://staging.metravi.com/wp-content/uploads/2020/09/Metravi-Instruments-Product-Catalog_V_01_19.pdf
Metravi central service centre is located in Kolkata. All products are to be sent to our Kolkata office for any service or repairs. We offer paid service post-warranty for all our products.

You need to check for: A. Incorrect emissivity B. Is the instrument seeing reflections from a hot surrounding source C. Is the instrument being affected by electrical noise entering into the cables or other wiring.

You need to check for:

  • Incorrect emissivity
  • Dirty lens or window
  • The instrument is not focused correctly
  • The line of sight is blocked with an obstruction.
Please check your account and Order details for the status of your order shipment. You can also check the online tracking status of your shipment on the respective courier company’s online trackers. In case of any further enquiry or issue, please get in touch with us.
Chat with Us