Psophometer – Wikipedia, the free encyclopedia. I learnt some basic instrumentation when i worked on above Instrument, Mr. Ravi Rao the Manager in Trans Marketing Pvt. Ltd. gave that opportunity. TMPL as it was known decades back was in Service and Sales of many Brands like Racal Dana, Genrad, Data I/O and Electronic Production Machinery. Related Resources Digital Psophometer Model 1072 Automatic Loss Measurement Weighting filter ‘A’ Weighting Filter For Audio Measurements Programmable Universal Filter C-Message Weighting