Rugged Wahl Models TM602, TM612, and TM630 measure t/cs, RTDs, and both t/c and RTDs. They can measure with accuracy of 0.02% of reading and temperature coefficient of 15 ppm/°C; 14 different t/c outputs; and 12 RTD types with temperature coefficient of 10 ppm/°C. Handheld thermometers include graphical LCD with adjustable contrast and backlight. Data can be recorded manually on event or automatically with user-programmed frequency.