The Michell Instruments PC33 and PC52 series offer comprehensive ranges of relative humidity probes for accurate, stable, and repeatable measurements. Both models provide analog output signals and optional temperature measurement. The PC33 features ±3% RH accuracy with single-point calibration, designed for HVAC applications. The PC52 offers ±2% RH accuracy with two-point calibration, ideal for controlled environments.

Key specifications: humidity range 0–100% RH, temperature range -20 to 80°C, RH sensor stability ±1% RH/year, response time <10 seconds (typical for 90% step change). Output signals include 4–20 mA, 0–1 V, 0–5 V, or 0–10 V. Analog zero and span adjustment are provided for easy field calibration.