Extech Instruments RH300, RH305, RH350 Catalog Page

RH305 kit

HYGRO-THERMOMETERS

Must-Have
Tools for IAQ

Regulating humidity and temperature is a

critical part of ensuring indoor air quality

(IAQ) in residential, commercial offi ces,

manufacturing and healthcare. Extech

psychrometers are a key tool for rapid

diagnostics & IAQ problem solving.

ÿ NIST traceable certificate with

data is available when you order your
meter with Certificate Traceable to
NIST. Look for this symbol ÿ next to
product part numbers.

ACCESSORIES

RH300-CAL 33% and 75%RH

RH350-CAL 33% and 75%RH

TP890 Thermistor Tem-

589250 RS-232 PC cable

USB100 RS-232 to USB

UA100-240 100-240V AC Adap-

Calibration Kit for
RH300

Calibration Kit for
RH350

perature Probe for
RH300

for RH350

Adaptor

tor w/4 plugs (US,
EU, UK, AU)

SPECIFICATIONS

Sensor Type Capacitance Capacitance
Dew Point -90.4 to 122°F (-68.0 to 49.9°C) -90.4 to 122°F (-68.0 to 49.9°C)
Wet Bulb -6.9 to 122°F (-21.6 to 49.9°C) -6.9 to 122°F (-21.6 to 49.9°C)
Humidity
Mixing Ratio — —

Internal Temperature
External Temperature

curacy)

IR Temperature

Emissivity — —
Field of View — —
PC Interface — Optional software & cable (589250)
Memory/Datalogging — 99 readings

CE Approved Yes Yes

Dimensions/Weight 7x1.9x1" (178.5x48.4x24.7mm)/ 3.3oz (95g) 9x2.2x1.7" (230x57x44)/ 5.3oz (153g)
Warranty 1 year 1 year

RH300/RH305

Hygro­Thermometer
Psychrometer

Temperature Probe for

Watch the

Video

www.extech.com/video

(Basic Accuracy) 0 to 100%RH (±3%RH) 0 to 100%RH (±3%RH)

(Basic Accuracy) -4 to 122°F /-20 to 50°C (±1.8°F/±1°C) -4 to 122°F/-20 to 50°C (±1.8°F/±1°C)

(Basic Ac-

(Basic Accuracy) ——

differential measurements

• Simultaneous display of %RH,
Temperature and Dew Point or
Wet Bulb or Probe Temperature

• Calculates T1-T2 differential
(Air Temperature minus
External Probe Temperature)
using optional probe (TP890)
and T2-Dew Point

• Data Hold and Auto power off

• MAX/MIN readings

• Optional TP890 probe for
Differential Temperature

• Model RH300 includes
2 AAA batteries

• Model RH305 kit includes
RH300, TP890 external
temperature probe,
RH300-CAL calibration
bottles and carrying case

þ

ÿ |

ÿ RH300

Thermistor: -4 to 158°F/-20 to 70°C
(±1.8°F or ±1°C)

RH305 ÿ

RH350 Dual

Input Hygro­Thermometer
Psychrometer

Two Type K External Probe
inputs for Superheat plus
memory

• Superheat differential
measurements: T1-T2, Air-T1,
and T1-Dew Point

• Backlit LCD displays 3
parameters: %RH and
Temperature with either Dew
Point, Wet Bulb or Type K

• RS232 interface – 407752
software available for download
at www.extech.com and
optional cable 589250
sold separately

• Stores up to 99 data points

• MAX/MIN with time stamp+AVG

• Data Hold, Auto power off

• Complete with 2 general
purpose Type K bead wire
probes, 4 AAA batteries

RH350 ÿ

Type K: -328 to 2498°F/-200 to 1370°C
(±0.3% or 1.8°F or ±1°C)

84

84

ÿ Indicates products that are available with optional calibration traceable to NIST. See page 160 for a complete listing.