Q: Some pressure ranges are missing from the unit selections.

A: The ranges are not missing from the unit. They may be selected or de-selected from the display. The procedure is listed on the last two pages of the Instruction Manual.

Q: Can I calibrate the unit in the field?

A:  Yes, the unit can be calibrated in the field by using the keypad, provided a accurate current and/or pressure sources are used. The procedure is listed in section 5.4 of the instruction manual.