Lascar el gfx dtp dual channel temperature probe data logger with graphic screen lascar el gfx dtp cal t the lascar el gfx dtp is a standalone usb dual channel temperature probe data logger with graphic screen this data logger measures and stores over 250 000 temperature readings from two thermistor probes over a 40degc to 125degc 40degf to 257degf range at a resolution of 01degcusing the windows control software available as a free download from wwweasylogusbcom the us