Miniature, battery powered Data Loggers record temperature, pressure, humidity, light, current, voltage, and events. Full software available for free download.Data Loggers and Sensors - Pace Scientific [ Home | What's New | Products | Contact | International Distributors ] Founded in 1991, Pace Scientific manufactures portable data loggers and sensors. Our top selling data logger, the XR440 Pocket Logger ? (photo below), is a four-channel data logger with direct-connect sensors for temperature , humidity , high pressure , low pressure , ac current , dc current , ac voltage and light . The XR4