Model GDL

Graphical Display Data Logger
Measure Temperature, Humidity and Dew Point, Instant Display

Series UDL

Universal Input Data Logger
Internal Temperature Sensor, Optional Internal Humidity Sensor and Display, Universal Inputs

Model GDL-T

Graphical Display Data Logger
3 External Temperature Sensors, 1 Internal Temperature Sensor

Series WTDL

Wireless Temperature/Humidity Data Logger
Transmission up to 400 Feet, Text/Email Alarm Updates