Gaurav Engineers Process Instrumentation and Controls manufactures Portable Temperature Indicator with Built-in 9V Battery. Gaurav Engineers Process Instrumentation and Controls is an ISO 9001:2008 certified company. The Company also manufactures various types of electronic equipments. The Differential Temperature Controller with Range 0 -100 Degree C, Model GTC 121, can indicate and control any process parameter such as temperature, pressure, level, length, flow, humidity, pH, speed, frequency, voltage, current etc. The Differential Temperature Controller with Range 0 -100 Degree C has LCD display and temperature range of -200 to 1600 Degree C. This Temperature Controller is available in size of 160 X 85 X 25mm.