Mastech, Thermometer, models:

EE-MS6501	Operator'S Instruction Manual
MS6500	User Manual
MS6501	User Manual
MS6511 SERIES	Manual
MS6518	Operation Manual
MS6520B	Manual
MS6522B	Quick Start Manual
MS6530	Operation Manual
MS6530B	Operation Manual
MS6530T	Operation Manual
MS6531ABC	User Manual
MS6540A	User Manual
MS6550A	User Manual
MS6550B	User Manual
ms6520a	Operation Manual