Handheld Model 5577 provides basic accuracy of ±0.05°C over its full range of -100 to +135°C. Unit has 2 inputs and can display simultaneous side-by-side readings from both inputs, or difference between 2 inputs for easy comparisons. Suited for petrochemical refineries and gas firms, thermometer is rated for instrinsic safety by Cenelec and carries EX II 2G EEx ib IIB T4 rating.