Translate the given Spanish text to English

The sexual intercourse safety is maintained as the device protects against infections and unwanted pregnancies.
La seguridad del acto sexual se mantiene en cuanto se protege de contagios o embarazos no deseados.

It prevents incorrect use of the meter.
SE EVITA EL USO INADECUADO DEL CONTADOR.

The sample is held between two clamps and a tensioning cylinder pulls a movable first clamp against the second stationery clamp.

La muestra es sostenida entre dos abrazaderas y un cilindro tensor jala una primera abrazadera movible contra la segunda abrazadera fija.