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EXTECH 365510 Stopwatch/Clock, Digital
EXTECH STW515 Stopwatch/Clock with Backlit Display
EXTECH HW30 Stopwatch, Heat Index
EXTECH 365510-NIST Stopwatch/Clock w/NIST, 365510
EXTECH STW515-NIST Stopwatch/Clock with Backlit Display w/ NIST
EXTECH CTH10A Clock, Radio Controlled, Temp/Humidity
EXTECH HW30-NISTL Stopwatch, w/Limited NIST - Time Function Only