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Less than 30 second RH response time with 2 percent RH accuracy, dual backlit LCD display, Data Hold, Min/Max, Auto Power Off (with disable), and low battery indicator.
| Battery Description | 1 x 9V battery |
| Mounting Type | Surface Mount |
| Upper Temperature Range | 93 u00b0C |
| Voltage | 9 volts |
| Temperature Accuracy | 1.8 |
| Temperature Reading Accuracy | plus_minus_1_point_8_degrees_celsius |
| Item Weight | 0.2 kg |
| Color | Green |
| Brand Name | Extech |
| Manufacturer | Extech |
| UPC | 793950444900 |
| Unit Count | 1 Count |
| Global Trade Identification Number | 00793950444900 |
| Included Components | Complete with carrying case and 9V battery |
| Item Length | 7 inches (17.8 cm) |
| Model | RH490 |
| Part Number | RH490 |
| Brand | Extech |
Ideal for HVAC technicians to measure humidity levels and ensure optimal climate control in buildings.
Beneficial for industrial settings to monitor and maintain humidity levels in critical processes and environments.
Great for homeowners seeking to manage humidity and comfort levels for health and comfort in living spaces.
Not suitable for outdoor conditions without protection as it may not withstand harsh weather environments.
EXTECH RH490 - Precision HYGRO-Thermometer with GPP (Grains per Pound) | RH (2% accuracy), temp, dew point, wet bulb, grains per pound (GPP), dual display, MIN/MAX, data hold, case
The EXTECH RH490 HYGRO-Thermometer has garnered mixed reviews from users, particularly those in professional settings. On one hand, many technicians Consider it to be the best on the market, praising its dual display and specific features like dew point, wet bulb readings, and grains per pound (GPP) metrics, which are particularly useful in their daily operations. Users appreciate the precision of the readings, claiming an accuracy of 2% for relative humidity and highlighting its dependable performance. However, durability is a significant concern among users, particularly those in demanding industries like water remediation. A critical point raised is the fragility of the sensor chip located at the top; users reported that the small copper connectors that secure the sensor can easily break, leading to malfunctioning devices. This has resulted in customers having multiple unusable meters that require expensive repairs, with some expressing frustration over the lack of accessibility to replacement parts and the high cost of professional servicing. In summary, the EXTECH RH490 is celebrated for its performance and precision in readings but is criticized for its lack of durability and high repair costs, leading to a divided reception among users. **
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