Context: Thermocouples' leads are often too short, necessitating the use of an extension lead.
Objective: To determine if temperature measures were influenced by extension-lead use or lead temperature changes.
Design: Descriptive laboratory study.
Setting: Laboratory.
Other participants: Experiment 1: 10 IT-21 thermocouples and 5 extension leads. Experiment 2: 5 IT-21 and PT-6 thermocouples.
Methods: In experiment 1, temperature data were collected on 10 IT-21 thermocouples in a stable water bath with and without extension leads. In experiment 2, temperature data were collected on 5 IT-21 and PT-6 thermocouples in a stable water bath before, during, and after ice-pack application to extension leads.
Results: In experiment 1, extension leads did not influence IT-21 validity (P = .45) or reliability (P = .10). In experiment 2, postapplication IT-21 temperatures were greater than preapplication and application measures (P < .05).
Conclusions: Extension leads had no influence on temperature measures. Ice application to leads may increase measurement error.