Amphenol SSI offers a useful, low-cost industrial pressure gauge in its MGA-30-A-9V-R. A frequent question for this product is whether it ships with calibration certification.
By default, the product does not ship with a certificate of calibration, though the datasheet does state it is shipped from the factory calibrated. if you require a certificate of calibration for this product, a version with NIST calibration is available. This is a special order through DigiKey and must be requested prior to order; the part cannot retroactively be NIST-calibrated. This option is also significantly more expensive than the non-NIST product. If possible for your application, I would recommend developing a procedure to test calibration yourself within your target environment.