A boiler's draught must be measured at seven separate sites. Accurate draught measurement may help you minimise emissions, increase boiler efficiency, and save money on your energy costs. Manas Microsystems produces Digital Draft. Indicators/Transmitters. When compared to mechanical gauges with analogue indications, these digital instruments are more accurate and simpler to read. Manas Draft measuring devices are relatively cost-effective as compared to expensive electronic gauge transmitters and are priced similarly to mechanical gauges.