£355.86

Extech RH490 Precision Hygro-Thermometer with GPP, Dew Point

Green, RH490

Price data last checked 9 day(s) ago - will refresh soon

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About as cheap as it gets. The only time it was cheaper was 3 months ago.

£356 today · all-time low £345 (Jun 2026) · usually £356

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Price History & Forecast

Grey patches = out of stock. Cheaper = lower on the chart. Hover for exact prices.

Last 82 days · 82 data points (no recent data)

Historical
Generating forecast…
£396.44 £340.18 £352.45 £364.73 £377.00 £389.28 £401.56 07 June 2026 27 June 2026 17 July 2026 06 August 2026 27 August 2026

Price Distribution

Price distribution over 82 days • 6 price levels

Days at Price
Current Price
32 days 23 days · current 6 days 6 days 7 days 8 days 0 8 16 24 32 £345 £356 £362 £388 £392 £396 Days at Price

Price Analysis

Most common price: £345 (32 days, 39.0%)

Price range: £345 - £396

Price levels: 6 different prices over 82 days

Description
Anyone whose job relies on calculating humidity levels will appreciate the Extech Hygro-Psychrometer. In addition to measuring relative humidity in 30 seconds, this handheld instrument captures dew point, wet bulb, temperature and water vapour levels (Grams per Kilogram and Grains per Pound). This utility tool will store maximum and minimum readings until the memory is cleared and includes a data-hold button for rapidly fluctuating measurements. Complete with carrying case and 9V battery. Box Contains Complete with carrying case and 9V battery

Key Features

Less than 30 second RH response time

Water Vapour in GPP and g/kg

Dual backlit display

Simultaneous display of Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb

Slim design with rubberized side grips

Product Specifications
Brand
Extech
Model
RH490
Colour
Green
ASIN
B000R8DTIK
Category
DIY & Tools > Power, Garden & Hand Tools > Measuring & Layout Tools > Scanners & Testers
Domain
Amazon UK
Release Date
26 February 2016
Listed Since
22 May 2012

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