Penn-Tech Cable Tensionmeter The Penn-Tech Cable Tensionmeter measures cable tension while suspended on the cable line, innovating the way cable tensions are measured by eliminating the need to disturb the cable anchor points. Full-Service Tower & Radome Specialists Since 1968, Penn-Tech International has provided comprehensive high-quality tower installation services including: Penn-Tech International offers these services for geodesic domes and inflatable envelopes: