Lascar el gfx dtp dual ch high accuracy temp probe data logger graphic screen lascar el gfx dtp cal t the lascar el gfx dtp is a dual channel high accuracy temperature probe usb data logger with graphic screen this data logger can measure and store over 250 000 temperature readings from two thermistor probes over a 40degc to 125degc 40degf to 257degf range at a resolution of 01degc using the windows control software available as a free download from wwweasylogusbcom