Starting price
฿48,000
/ % RH
Vaisala HM70 Hand-Held Humidity Meter
Model: HM70
The Vaisala HM70 is a hand-held humidity and temperature meter using HUMICAP® thin-film capacitive sensing for high stability and slow drift. It measures 0–100% RH with ±1.5% RH accuracy at 20°C, making it a trusted field reference for cleanroom, pharmaceutical storage, and GMP environment monitoring. Interchangeable probe options cover high-temperature, low-temperature, and IP-rated applications from a single base unit. Calibration is traceable to NIST/MIKES standards and can be performed using the Vaisala HMK15 humidity calibrator.
Meas. Range
0–100 % RH
Accuracy
±1.5% RH at 20°C
Specifications
| Interface | USB, RS-232 serial |
| Sensor Type | HUMICAP® capacitive |
| Humidity Range | 0 – 100 % RH |
| Temperature Range | -40 to +180 °C (probe-dependent) |
| Temperature Accuracy | ±0.2 °C (at 20°C) |
| RH Accuracy (at 20°C) | ±1.5 % RH |
Use Cases
Cleanroom monitoring per ISO 14644, pharmaceutical storage per GDP requirements, warehouse environmental checks, and testing of moisture-sensitive materials.
Frequently Asked Questions
How often should a humidity meter be calibrated?+
Every 6–12 months. ISO 17025 and GMP labs typically require 6-month intervals because humidity sensors drift with age and contamination exposure.
Why is HUMICAP better than a generic capacitive sensor?+
Vaisala's HUMICAP thin-film structure drifts less when exposed to 100% RH or contaminants compared to standard sensors, and can recover after purging with dry nitrogen.
Is ±1.5% RH accuracy sufficient for ISO Class 7 cleanroom use?+
Yes for routine environmental logging. For IQ/OQ qualification requiring uncertainty ≤ ±1% RH, send to a lab with a traceable humidity chamber for calibration.
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