Test Instruments
Temperature and Humidity Measuring
Digital Psychrometers and Humidity Meters
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$300 - $400 $300 - $400 (1)
$400 - $500 $400 - $500 (1)
$500 - $600 $500 - $600 (1)
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Hygro Thermometer Hygro Thermometer (2)
Hygro Thermometer Psychrometer Hygro Thermometer Psychrometer (2)
Hygro-Thermometer Hygro-Thermometer (1)
Psychrometer Psychrometer (2)
Temperature Humidity Meter Temperature Humidity Meter (4)

Humidity Range

0 to 1,120 GPP/0 to 160 g/kg (Absolute), 0% to 100% (RH) 0 to 1,120 GPP/0 to 160 g/kg (Absolute), 0% to 100% (RH) (1)
0% to 100% 0% to 100% (3)
10% to 85% 10% to 85% (1)
10% to 90% 10% to 90% (3)
10% to 95% 10% to 95% (1)
20% to 95% 20% to 95% (1)
5% to 95% (1)
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Humidity Accuracy

+/-2% +/-2% (3)
+/-3% +/-3% (3)
+/-4% +/-4% (1)
+/-5% +/-5% (4)

Ambient Temperature Range

-22 Degrees to 199 Degrees F/-30 Degrees to 100 Degrees C -22 Degrees to 199 Degrees F/-30 Degrees to 100 Degrees C (3)
-4 Degrees to 122 Degrees F/-20 Degrees to 50 Degrees C -4 Degrees to 122 Degrees F/-20 Degrees to 50 Degrees C (1)
-4 Degrees to 122 Degrees F/-20 Degrees to 50 Degrees C (Indoor), -4 Degrees to 158 Degrees F/-20 Degrees to 70 Degrees C (Outdoor) -4 Degrees to 122 Degrees F/-20 Degrees to 50 Degrees C (Indoor), -4 Degrees to 158 Degrees F/-20 Degrees to 70 Degrees C (Outdoor) (1)
-4 Degrees to 140 Degrees F/-20 Degrees to 50 Degrees C -4 Degrees to 140 Degrees F/-20 Degrees to 50 Degrees C (1)
0 Degrees to 50 Degrees C, 32 Degrees to 122 Degrees F 0 Degrees to 50 Degrees C, 32 Degrees to 122 Degrees F (1)
14 Degrees to 140 Degrees F 14 Degrees to 140 Degrees F (1)
14 Degrees to 122 Degrees F/-10 Degrees to 50 Degrees C (2)

32 Degrees to 122 Degrees F/0 Degrees to 50 Degrees C (1)
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Ambient Temperature Accuracy

+/-0.3% or +/-1.8 Degrees F/ +/-1 Degrees C (Outdoor), +/-1.8 Degrees F or +/-1 Degrees C (Indoor) +/-0.3% or +/-1.8 Degrees F/ +/-1 Degrees C (Outdoor), +/-1.8 Degrees F or +/-1 Degrees C (Indoor) (1)
+/-0.4% + 1.8 Degrees F/1 Degrees C (Type K, Type J) +/-0.4% + 1.8 Degrees F/1 Degrees C (Type K, Type J) (1)
+/-1 Degrees C, +/-2 Degrees F +/-1 Degrees C, +/-2 Degrees F (1)
+/-1.8 Degrees F +/-1.8 Degrees F (6)
+/-2.0 Degrees F +/-2.0 Degrees F (1)
+/-2.5 Degrees F/ +/-1.2 Degrees C +/-2.5 Degrees F/ +/-1.2 Degrees C (1)

Wet Bulb Globe Temperature Range

-4 Degrees to 140 Degrees F/-20 Degrees to 60 Degrees C -4 Degrees to 140 Degrees F/-20 Degrees to 60 Degrees C (1)
-6.9 Degrees to 122 Degrees F/-21.6 Degrees to 49.9 Degrees C -6.9 Degrees to 122 Degrees F/-21.6 Degrees to 49.9 Degrees C (2)
-6.9 Degrees to 122 Degrees F/-21.6 Degrees to 50 Degrees C -6.9 Degrees to 122 Degrees F/-21.6 Degrees to 50 Degrees C (1)
14 Degrees to 122 Degrees F/-10 Degrees to 50 Degrees C 14 Degrees to 122 Degrees F/-10 Degrees to 50 Degrees C (2)
32 Degrees to 176 Degrees F/0 Degrees to 80 Degrees C 32 Degrees to 176 Degrees F/0 Degrees to 80 Degrees C (3)

Overall Height

0.7" 0.7" (1)
5.7 in 5.7 in (1)
5.9 in 5.9 in (1)
5.906 in 5.906 in (1)
7 in 7 in (1)
7.2 in 7.2 in (1)
7.8 in (3)

9 in (1)

9.8 in (1)
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Overall Depth

0.7 in 0.7 in (1)
1 in 1 in (2)
1.109 in 1.109 in (1)
1.3 in 1.3 in (4)
1.7 in 1.7 in (1)
1.9 in 1.9 in (1)
2.1" (1)
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Overall Width

0.35" 0.35" (1)
0.8 in 0.8 in (1)
1.2 in 1.2 in (1)
1.7 in 1.7 in (3)
1.9 in 1.9 in (1)
2.109 in 2.109 in (1)
2.2 in (1)

2.8 in (1)

2.9 in (1)
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Dew Point Range

-13.5 Degrees to 120.1 Degrees F/-25.3 Degrees to 48.9 Degrees C -13.5 Degrees to 120.1 Degrees F/-25.3 Degrees to 48.9 Degrees C (1)
-22 Degrees to 199 Degrees F -22 Degrees to 199 Degrees F (3)
-4 Degrees to 140 Degrees F -4 Degrees to 140 Degrees F (1)
-90.4 Degrees to 122 Degrees F/-68.0 Degrees to 49.9 Degrees C -90.4 Degrees to 122 Degrees F/-68.0 Degrees to 49.9 Degrees C (2)

Display Screen Type

Backlit LCD Backlit LCD (6)
LCD LCD (4)

Response Time

1 sec 1 sec (1)
120 sec 120 sec (1)
180 sec 180 sec (1)
3 sec 3 sec (1)
30 sec 30 sec (4)
60 sec 60 sec (2)

Meter Type

Basic Function Relative Humidity and Temperature Meter Basic Function Relative Humidity and Temperature Meter (1)
Compact Digital Psychrometer and Humidity Meter Compact Digital Psychrometer and Humidity Meter (3)
Dew Point and Wet Bulb Humidity Meters with Cabled Main Probe Dew Point and Wet Bulb Humidity Meters with Cabled Main Probe (1)
Dew Point and Wet Bulb Humidity Meters with Onboard Main Probe Dew Point and Wet Bulb Humidity Meters with Onboard Main Probe (5)
Environmental Meter Environmental Meter (1)

Properties Measured

Absolute Humidity, Ambient Temperature, Contact Temperature, Dew Point, Non-Contact Temperature, Relative Humidity, Water Vapor Level, Wet Bulb Temperature Absolute Humidity, Ambient Temperature, Contact Temperature, Dew Point, Non-Contact Temperature, Relative Humidity, Water Vapor Level, Wet Bulb Temperature (1)
Air Velocity, Light Level, Relative Humidity, Sound Level, Temperature Air Velocity, Light Level, Relative Humidity, Sound Level, Temperature (1)
Ambient Temperature, Dew Point, Relative Humidity, Wet Bulb Temperature Ambient Temperature, Dew Point, Relative Humidity, Wet Bulb Temperature (6)
Ambient Temperature, Relative Humidity, Wet Bulb Temperature Ambient Temperature, Relative Humidity, Wet Bulb Temperature (2)
Relative Humidity, Ambient Temperature Relative Humidity, Ambient Temperature (1)

Probe Design

Cabled Cabled (1)
Compact Compact (1)
On-Board On-Board (1)
Onboard Onboard (7)

Includes NIST-Traceable Calibration Certificate

No No (10)
Yes Yes (1)

Data Logging

No No (7)
Yes Yes (4)

Battery Type

(2) AAA (2) AAA (1)
(3) AAA (3) AAA (1)
(4) AAA (4) AAA (1)
(6) AA (6) AA (1)
(6) AAA (6) AAA (1)
3V Lithium 3V Lithium (1)
9V (3)

LR44 (1)
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Battery Run Time

150 hr 150 hr (1)
24 hr 24 hr (3)
300 hr 300 hr (1)
80 hr 80 hr (1)

Humidity Resolution

0.1 % 0.1 % (9)
1 % 1 % (1)
1% 1% (1)

Weight

0.25 oz 0.25 oz (1)
0.7 oz 0.7 oz (1)
2.3 oz 2.3 oz (1)
2.8 oz 2.8 oz (1)
23.1 oz 23.1 oz (1)
3.3 oz 3.3 oz (1)
5.3 lb (1)

7 oz (3)
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Digital Psychrometers and Humidity Meters

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EXTECH
PSYCHROMETER DATALOGGER DIGITAL
Item # EXTRH350
Mfr. Model # RH350

EHC: EHC :

Relative humidity/temperature meter with datalogging, relative range 0 to 100%, humidity accuracy +/- 3%, humidity resolution 0.1%, temperature range air - 20 to 50 degrees c/external probe -200 to 1,370 degrees Celsius, temperature accuracy +/- degree f,

Relative humidity/temperature meter with datalogging, relative range 0 to 100%, humidity accuracy +/- 3%, humidity resolution 0.1%, temperature range air - 20 to 50 degrees c/external probe -200 to 1,370 degrees Celsius, temperature accuracy +/- degree f,

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EXTECH
PRECISN PSYCHROMTR W/CALIBRATN CERT
Item # EXTRH390NIST
Mfr. Model # RH390NIST

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EXTECH
EZSMART HYGRO-THERMOMETER
Item # EXTRHT3
Mfr. Model # RHT3

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EXTECH
HYGRO-THERMOMETER PSYCHROMETER
Item # EXTRH300
Mfr. Model # RH300

EHC: EHC :

Simultaneous display of percent RH, temperature and dew point or wet bulb or probe temperature. Wet bulb measurements without slinging. Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890) and T-2 d

Simultaneous display of percent RH, temperature and dew point or wet bulb or probe temperature. Wet bulb measurements without slinging. Calculates T1-T2 differential (air temperature minus external probe temperature) using optional probe (TP890) and T-2 d

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EXTECH
PEN HUMIDITY + TEMPERATURE
Item # EXT445580
Mfr. Model # 445580

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EXTECH
PRECISION HYGRO-THERMOMETER
Item # EXTRH490
Mfr. Model # RH490

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EXTECH
HUMIDITY TEMPERATURE PEN
Item # EXT44550
Mfr. Model # 44550

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EXTECH
PSYCHROMETER PRECISION
Item # EXTRH390
Mfr. Model # RH390

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EXTECH
HYGRO-THERMOMETER SD LOGGER
Item # EXTSDL500
Mfr. Model # SDL500

EHC: EHC :

Hygro-Thermometer, Relative Humidity Range 5 to 95, Humidity Accuracy 3, Temp. Range (F) 32 to 122, Dew Point Range -13.5 to 120.1F (-25.3 to 48.9C), Wet Bulb Temperature Range -6.9 to 122F (-21.6 to 50C), Surface Temp. -148 to 2192 F, Temp. Accuracy 0.4

Hygro-Thermometer, Relative Humidity Range 5 to 95, Humidity Accuracy 3, Temp. Range (F) 32 to 122, Dew Point Range -13.5 to 120.1F (-25.3 to 48.9C), Wet Bulb Temperature Range -6.9 to 122F (-21.6 to 50C), Surface Temp. -148 to 2192 F, Temp. Accuracy 0.4

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EXTECH
METER ENVIRONMENTAL 5-IN-1
Item # EXTEN300
Mfr. Model # EN300

EHC: EHC :

Environmental Meter, Hygro-Thermometer-Anemometer-Light-Sound Meter, 10 to 95 Percent Relative Humidity Range, 4 Percent Humidity Accuracy, Temp. Range (F) Thermistor: 32 to 122: Type K: -148 to 2372, Temp. Range (C) Thermistor: 0 to 50. Type K: -100 to 1

Environmental Meter, Hygro-Thermometer-Anemometer-Light-Sound Meter, 10 to 95 Percent Relative Humidity Range, 4 Percent Humidity Accuracy, Temp. Range (F) Thermistor: 32 to 122: Type K: -148 to 2372, Temp. Range (C) Thermistor: 0 to 50. Type K: -100 to 1

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EXTECH
HYGRO THERMOMETER,5-29/32 IN H,LCD
Item # FLSRH250W
Mfr. Model # RH250W

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