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Description
- Description
- Features:
- Specifications:
- Downloads:
Description
The Extech RH390 is a high-accuracy handheld psychrometer that simultaneously displays relative humidity and one of three temperature parameters: ambient air temperature, dew point, or wet bulb temperature. Featuring a slim ergonomic design with rubberized sides for secure one-handed operation, a dual backlit display, and fast response time (<30 seconds for RH), the RH390 delivers laboratory-grade precision in field applications. With ±2% RH accuracy—the highest in its class—it’s ideal for HVAC, industrial hygiene, environmental monitoring, and building diagnostics. The unit includes Data Hold, Min/Max recording, auto power-off (with disable option), and comes with a carrying case and 9V battery.
Features:
- Simultaneous dual display: %RH + Temperature, Dew Point, or Wet Bulb
- Highest-in-class humidity accuracy: ±2% RH
- Fast RH response time: less than 30 seconds
- Slim, ergonomic design with rubberized sides for one-handed use
- Dual backlit LCD for easy reading in low-light conditions
- Data Hold and Min/Max functions for all measurements
- Auto power-off (can be disabled) and low battery indicator
- Complete with carrying case and 9V battery
Specifications:
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| Relative Humidity | 0 to 100% RH | 0.1% RH | ±2% RH |
| Air Temperature | –22 to 199°F (–30 to 100°C) | 0.1° | ±1.8°F (±1°C) |
| Dew Point | –22 to 199°F (–30 to 100°C) | 0.1° | Derived from RH & temp |
| Wet Bulb Temperature | 32 to 176°F (0 to 80°C) | 0.1° | Derived from RH & temp |
| Response Time (RH) | <30 seconds | — | — |
| Display | Dual backlit LCD | — | — |
| Power Source | 9V battery (included) | — | — |
| Dimensions | 7.8 x 1.7 x 1.3" (200 x 45 x 33 mm) | — | — |
| Weight | 7 oz (200 g) | — | — |
Downloads:
Refund Policy
Returns & Exchanges Policy
RETURNING THE PURCHASE
- Refunds on Cash On Delivery (COD) orders will be credited to your MMT eWallet, which can be used for future purchases. Future purchases will be subject to the same COD/shipping fee procedures, if applicable.
- Credit Card returns will be credited back to your original credit card.
- Value Added Tax (VAT) on the product purchased will be refunded.
- If an item you ordered is unavailable, we will notify you by email as soon as possible. If payment has already been made, refunds will be credited back to the original payment card used for the transaction.
- MMT eWallet credits have an expiry period of 12 months.
ORGANISING RETURNS OR EXCHANGES FOR REGISTERED CUSTOMERS
- To organize a return or exchange, registered users must log in to their registered account. Navigate to ‘My Account’ and then to ‘Returns & Exchanges’ to submit your request. The request for a refund must be made within 14 days of receiving your order. You will receive a notification upon completing the request.
- You can track your return or exchange by clicking on ‘Track Your Order’.
ORGANISING RETURNS OR EXCHANGES FOR GUEST USERS
- Guest users must submit a request via email to info@mmt.com within 14 days of receiving their order. Alternatively, you can contact Customer Care at +966-548907080 from Saturday to Thursday , 8:00 am to 8:00 pm (GMT+4). During Ramadan, our working hours are from 8:00 am to 8:00 pm, Monday to Friday.
ADDITIONAL INFORMATION
- Returned items must be received within 14 days of receiving the full order. Returns received after this period will not be processed and will be returned at your expense.
- If you placed an order with multiple items, you can only request a return once all items from your order have been delivered.
- Return or exchange of items is only permissible once.
- Any additional items returned that were not included in the approved list will be sent back to you, and shipping costs will be charged.
- All items must be returned in one package and in their original packaging with all tags attached. This includes any belts or designer packaging included with the item. If items are not returned in their original state, or are used and without tags, they will be sent back to you, and you will incur shipping charges. You will not be allowed to choose your shipping method; returns will be processed through our designated shipping companies only.
- All items are quality checked before dispatch. If you receive a damaged or faulty item, please log in to your registered account, go to ‘My Account’, and follow the steps within 48 hours of receiving your order. Guest users can submit a request via the ‘Track Your Order’ page.
- You will receive an email confirming that your return or exchange item(s) has been received, and the refund will be processed accordingly.
MMT RIGHTS
- MMT reserves the right to refuse refunds or exchanges on items deemed unfit for resale.
- Returns made outside the 14-day timeframe will not be accepted and will be returned to you at your expense.