Hanna Instruments HI 98510 Checktemp 1F Thermistor Thermometer, with Stainless Steel Probe and 1m Cable, -58.0 to 302.0 degrees F (+ or - 0.5 degrees F [-4 to 194 degrees F inside/ + or - 1 degrees F outside), 4.2" H x 2.3" W x 0.7" D