When using HVI equipment for characterizing samples from breeding program, specific operating methodology should be applied. This methodology may vary for every type or model of HVI. The cotton technology laboratory at Cirad-CA just acquired a Spectrum HVI model that has to meet the required confidence intervals for its measurements. The Spectrum model has been matched against the old model (ZUS 910B) length strength tester using 57 cottons covering a wide range of characteristics. Results show that the relationship between ZUS 910B and Spectrum is good for length parameters, medium for strength and poor for elongation.