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The bioinstrumentation system biobelt.

The accompanying sign reads

Belt unit worn by Tom Stafford during his mission to the moon on Apollo 10. The belt held a variety of sensing devices used to detect and transmit metabolic signals, such as heart rate, back to Earth to doctors in Mission Control.

The biobelt had snap fasteners to mate the biobelt to the midriff section of either the constant wear garment (CWG) or liquid cooling garment (LCG).