testo 608-H1 Temperature and Humidity Meter
| Brand | testo |
|---|---|
| Origin | Germany |
| Model | testo 608-H1 |
| Operating Temperature Range | 0 to +50 °C |
| Storage Temperature Range | −40 to +70 °C |
| Temperature Accuracy | ±0.5 °C |
| Temperature Resolution | 0.1 °C |
| Humidity Range | 10 to 95 %RH |
| Humidity Accuracy | ±3 %RH |
| Humidity Resolution | 0.1 %RH |
| Dew Point Calculation | Yes |
| Measurement Interval | 18 s |
| Battery Type | 9 V block battery |
| Battery Life | 8736 h (typ.) |
| Weight | 168 g |
| Dimensions | 120 × 89 × 40 mm |
| Housing Material | ABS |
| Temperature Sensor Type | NTC |
| Humidity Sensor Type | Capacitive |
Overview
The testo 608-H1 Temperature and Humidity Meter is a compact, handheld environmental monitoring instrument engineered for continuous, reliable measurement of ambient temperature, relative humidity (RH), and calculated dew point. Designed in accordance with ISO 7726 and DIN EN 60751 standards for thermal comfort and indoor air quality assessment, the device employs a high-stability NTC thermistor for temperature sensing and a polymer-based capacitive humidity sensor—optimized to maintain accuracy even under transient condensation conditions. Its fixed 18-second measurement cycle ensures consistent data acquisition without user intervention, making it suitable for unattended long-term logging in laboratories, HVAC commissioning, cleanroom validation, and archival storage environments. The meter operates exclusively on a standard 9 V alkaline block battery, delivering over one year of continuous operation (8736 h typical) under nominal conditions—eliminating the need for external power or recharging infrastructure.
Key Features
- Integrated dew point calculation based on real-time temperature and RH inputs, compliant with ASHRAE Fundamentals Chapter 1 (2023)
- Simultaneous display of temperature (°C), relative humidity (%RH), and dew point (°C) on a high-contrast LCD screen
- Automatic min/max value tracking for both temperature and humidity—retained after power-off
- Condensation-resistant humidity sensor architecture, validated per IEC 60068-2-30 for damp heat cycling
- Rugged ABS housing rated IP54 for dust and splash resistance—suitable for industrial and field deployment
- No moving parts or consumables; calibration traceable to national metrology institutes (e.g., PTB, NIST)
Sample Compatibility & Compliance
The testo 608-H1 is intended for non-invasive, ambient air measurements only—no probe immersion, duct insertion, or pressurized gas stream applications. It complies with electromagnetic compatibility requirements per EN 61326-1:2013 (industrial environment class) and meets RoHS 2011/65/EU and REACH (EC 1907/2006) material restrictions. While not certified for hazardous area use (ATEX/IECEx), its passive sensor design and low-power operation render it appropriate for general-purpose monitoring in GxP-regulated facilities where environmental parameters support process validation (e.g., stability chambers, packaging lines). Documentation includes factory calibration certificate with uncertainty values stated per ISO/IEC 17025:2017.
Software & Data Management
The testo 608-H1 operates as a standalone instrument with no built-in data logging or PC interface. However, it serves as a primary verification tool within broader environmental monitoring systems that adhere to FDA 21 CFR Part 11 requirements—particularly when deployed alongside testo’s Saveris 2 cloud-based platform (via optional wireless gateway). In such configurations, the 608-H1 provides immediate field verification against logged sensor networks during audit trails, supporting GLP and GMP-compliant temperature/humidity mapping studies. All displayed values are updated every 18 seconds with no interpolation or filtering—ensuring raw, time-synchronized readings for cross-reference validation.
Applications
- Validation of HVAC performance in pharmaceutical manufacturing suites (ISO 14644-1 Class 5–8 environments)
- Monitoring of archival storage conditions for museum artifacts and medical records per ANSI/NISO Z39.77-2022
- Field verification of hygrometer accuracy during IQ/OQ/PQ protocols for environmental chambers
- Baseline assessment of indoor air quality (IAQ) in office buildings per EN 16798-1:2019
- Supporting ISO 17025-accredited calibration labs for secondary reference checks of humidity generators
- Education and training labs requiring stable, repeatable environmental parameter references
FAQ
Does the testo 608-H1 support data export or USB connectivity?
No—the device lacks internal memory, Bluetooth, or wired interfaces. It is designed solely for real-time visual readout and manual recording.
Can it be used in outdoor environments?
It is rated for operation between 0 °C and +50 °C and IP54 ingress protection; however, prolonged exposure to direct sunlight or rain is not recommended due to LCD thermal drift and housing UV degradation.
Is the humidity sensor replaceable by the user?
No—the capacitive humidity sensor is sealed within the unit and not serviceable. Full unit recalibration or replacement is required if sensor drift exceeds ±3 %RH.
What standards does its temperature accuracy comply with?
The ±0.5 °C specification aligns with DIN EN 60751 Class B tolerance for NTC sensors at 25 °C, verified across the full 0–50 °C operating range.
How is traceability maintained for calibration?
Each unit ships with a testo-certified calibration certificate referencing PTB-traceable standards; users may request accredited calibration (DIN EN ISO/IEC 17025) through authorized testo service centers.
