Supertech Services Ltd. Supplies Surface Temperature Measuring Indicators. Supertech Services Ltd. Offers various types of welding products in Welding Industry. The Surface Temperature Measuring Indicators are simple, easy-to-use surface indicator that delivers reliable and accurate results, with no gauges or electronics and no calibration required. The Surface Temperature Measuring Indicators features a slim holder and dense chalk design, specifically engineered for smooth operation while maximizing user efficiency. This device provides the comfort, confidence and cost-effectiveness.