sealed instrument

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Noun1.sealed instrument - a contract that is signed and has the (wax) seal of the signer attached
contract - a binding agreement between two or more persons that is enforceable by law
References in periodicals archive ?
A sealed instrument panel inside the cab displays warning, indicator and diagnostic functions of the H series wheel loaders.
While designing their 9A1990 liquid oxygen level gauges for high-altitude military transports, the design engineers at Transicoil Inc, Norristown, PA, were challenged to find a method for mechanically adjusting a hermetically sealed instrument from the outside--without breaching the seal.