£356.50

Extech RH490 Precision Hygro-Thermometer with Grains Per Pound Display

RH490

Price data last checked 125 day(s) ago - refreshing...

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Same price for 13 weeks. Today is much like next week.

£357 for 88 days straight · last change was Nov 2025

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Price History & Forecast

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

Last 606 days • 606 data points (No recent data available)

Historical
Generating forecast...
£436.54 £216.11 £264.20 £312.30 £360.39 £408.49 £456.58 05 June 2024 03 November 2024 03 April 2025 01 September 2025 31 January 2026

Price Distribution

Price distribution over 606 days • 4 price ranges

Days at Price
Current Price
269 days 8 days 119 days · current 210 days 0 67 135 202 269 £236-276 £316-356 £356-396 £396-437 Days at Price

Price Analysis

Most common range: £236-276 (269 days, 44.4%)

Price range: £236 - £437

Price levels: 4 price ranges over 606 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
Format
DIY & Tools
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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