# Extech RHT50 Humidity/Temperature/Pressure Datalogger # Extech RHT50 Humidity/Temperature/Pressure Datalogger ## Key Features At A Glance - Records humidity, temperature, and atmospheric pressure with 10,000-point memory - USB interface for setup, configuration, and data download directly to a computer - Selectable atmospheric pressure units: psi, hPa, kPa, and bar - User-programmable sampling rate from 1 minute to 18 hours - User-programmable Min/Max alarm thresholds with Red/Yellow and Green LED status indication - Manual and programmable start modes for flexible logging campaigns - Temperature range -40 to 158°F (-40 to 70°C); humidity 0 to 100%RH - Ships with 3.6V lithium battery, mounting bracket, and Windows-compatible analysis software The Extech RHT50 is a compact USB datalogger that records humidity, temperature, and atmospheric pressure in a single pen-style instrument. It captures up to 10,000 readings at a user-programmable sample rate and connects directly to a PC's USB port for configuration and data download — no separate interface cradle or cable required. The RHT50 is positioned for environmental monitoring in clean rooms, warehouses, storage rooms, freezers, shipping vans, and water damage restoration work. Its three-parameter measurement set — humidity, temperature, and atmospheric pressure together — makes it useful for applications where pressure-sensitive storage or transit conditions need to be documented alongside the more typical temperature and humidity logs. ValueTronics stocks the Extech RHT50 and supporting accessories at our 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, where every new unit is processed and prepared for shipment by our in-house team rather than drop-shipped through a third-party fulfillment chain. That direct handling is what lets us speak to specific unit availability, accessory completeness, and shipping timelines when you call. ## Brand Heritage Extech Instruments operates as part of the Teledyne FLIR group, after FLIR Systems acquired Extech and was itself acquired by Teledyne Technologies in 2021. The Extech brand and product line have been maintained through these ownership transitions, and the RHT50 datasheet still carries the 'A FLIR COMPANY' designation from that lineage. ## Accessories Supplied - 3.6V Lithium battery - Mounting bracket - Windows-compatible analysis software ## Product Core & Specifications Specifications Range Resolution Accuracy (%rdg + digits) Temperature \-40 to 158°F 0.1°F ±1.8°F (14 to 104°F) \-40 to 158°F 0.1°F ±3.6°F (-40 to +14 and 104 to 158°F) \-40 to 70°C 0.1°C ±1.0°C (-10 to 40°C) \-40 to 70°C 0.1°C ±2.0°C (-40 to -10 and +40 to 70°C) Humidity 0 to 100%RH 0.1%RH ±3.5%RH Air Pressure 13.7 to 15.2 psi 0.1 psi — 950 to 1050 hPa 0.1 hPa — 95 to 105 kPa 0.1 kPa — 0.9 to 1.0 bar 0.1 bar — Datalogging interval 1 minute to 18 hours Memory 10,000 points Dimensions 5.1 x 1.1 x 0.98 in. (130 x 30 x 25 mm) Weight 1 oz (20 g) **Important:** Datasheet specifies a 3.6V lithium battery (replacement part 42299, package of two). Software compatibility as printed: Windows 98, 2000, XP, and Vista.Recommended pairing: order the 42299 3.6V lithium battery two-pack alongside the RHT50 to keep a spare on hand for long-duration unattended logging deployments. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 167.99 USD - **Vendor:** Extech - **Type:** Data Log - **Tags:** Data Logger, Extech, Manufacturers, Meters & DAQ, product_manual_group_2, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 167.99 USD | In stock | ## Images - Extech RHT50 Humidity/Temperature/Pressure Datalogger --- > Source: [ValueTronics](https://valuetronics.com/products/rht50-extech-data-logger-new) > Updated: 2026-05-30