RTD Temperature Calibrator for Field Calibration CAL-404 is specifically engineered for simulating and measuring PT100 RTD sensors with precision and efficiency. It is specially designed for professionals who need a reliable and accurate Field RTD Calibrator. This compact and rugged instrument is the ideal solution for on-site temperature calibration tasks, testing, and troubleshooting. Whether you’re working in industrial environments or lab settings, the CAL-404 RTD Calibrator delivers the performance needed to ensure accurate and reliable measurements across a wide range of temperature devices.