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The Extech RH490 has the highest 2% RH accuracy with Grains per Pound (GPP) and Grams per kilogram (g/kg) measurement.
Humidity 0 to 100%RH
Temperature (Internal) -22 to 199°F (-30 to 100°C)
Basic Accuracy ±2%RH, ±1.8°F/1°C
Max. Resolution 0.1%RH, 0.1°F/°C
Dewpoint -22 to 199°F (-30 to 100°C)
Wet Bulb 32 to 176 °F (0 to 80°C)
Absolute Humidity 0 to 1120GPP (0 to 160g/kg)
Dimensions 7.8x1.7x1.3" (200x45x33mm)
Weight 7oz (200g)
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