These precision measuring instruments (precision class AA) with 5 or 9 inputs (up to 36+4 channels) perform up to 100 measurements per second. The sleep mode for long-term recording and the big memory makes it suitable as a data logger. Rechargeable batteries are integrated. Each ALMEMO input/connector has up to 4 sensor channels that can display directly measured values (for ex. humidity) or calculated results, which are calculated inside the intelligent connector (for ex. dew-point). But the measuring instrument also has another 4 auxiliary function channels. The large graphic display with 16 lines shows time histories as line diagrams or actual values as a bar chart. Numerical values can be shown in 3 sizes. Multiple configurations available: with 5 or 9 inputs, electrically isolated measuring module, external memory card, integrated pressure sensor, IP54 protection, multi-point calibration, etc…