Digital 4 Channels K-Type Thermometer Thermocouple Sensor Tester with K-Type Metal & Bead Probe Backlight Kelvin Scale Dual High Temperature -50~1350°C (-58~2462°F) Max/Min/Avg: Amazon.com: Industrial & Scientific
1m 2m K Type Thermocouple Temperature Sensor Cable Stainless Steel Probe Industrial Thermal Thermocouple Tester 0-800 Degree C - Instrument Parts & Accessories - AliExpress
XH-B310 Industrial Digital Thermometer Temperature Meter K-type M6 Thermocouple Tester -30~800℃ Thermograph High Accuracy with LED-Display - Walmart.com
FLUKE-714 CAL - Fluke - Calibrator, Calibrated, Thermocouple