Rex DD-4 Operating Instructions

Quick Instructions:

To turn indicator on: Press ON/Clr.
To turn indicator off: Press OFF/Mode.
To clear display to zero: Press ON/Clr.
To turn Auto Off Function on or off: Press 2nd (note – an hourglass will appear on the left side of the display when Auto Off feature is active). Press OFF.
To Activate Hold: Press and release HOLD.
To turn tolerances on/off: Press TOL (note – “TOL” will show on display when no tolerances have been set).
To Set Tolerance Numbers: Press and hold TOL until HIGH is flashing. Press 2nd. Press CHANGE. Press MOVE until the +/- sign or digit to be set is blinking. Press CHANGE to reverse the +/- sign or increment the blinking digit. Repeat MOVE and CHANGE until the desired number is entered. To clear, press ON/clr. Repeat these steps to set low tolerance.
To clear all settings and return to factory set defaults: Press 2nd. Press ON/clr. Press IN/MM. Note – total reset cannot be accomplished if lock feature is on.
To turn Feature Lock feature on/off: Press 2nd. Press ON/Clr. Press TOL. Note – a key will appear on the bottom left side of the display when features are locked.
To store readings: Press and release 2nd. Press and release HOLD. The number that is displayed when hold is released will be stored in the durometer (Θ appears on screen for approximately 2 seconds).
To view and scroll through readings: Press and release 2nd. Press and hold HOLD for 3 seconds, then release when the screen changes and both Θ and number appear. The sequence number of the reading will be displayed first, then the value of it, beginning with the most recent reading. Press MOVE to scroll through the readings. The durometer will store up to 200 readings, then will delete readings beginning with the oldest one first.
To exit stored reading viewer: Press and release HOLD and the Θ will disappear from the screen.
To download readings to a data collection device use the USB cable (item #26361) and follow the instructions shown here. To download readings to any Windows applications, use the USB Smart Cable (item #26362) and follow the instructions shown here.
To clear all stored readings: Be sure the durometer is in “View” mode (follow “view and scroll” instructions, above, if necessary). Press ON/Clr until “None” appears on the screen. Press and release HOLD to exit.

Power:

The durometer uses two internal batteries or an external AC adapter. To install batteries, use a narrow screwdriver to gently pry under the tab on the left side of the bezel and slide out the battery tray. Insert two batteries + side up, and slide the battery tray back into the bezel. NOTE: To prevent damage from battery leakage or corrosion, it is strongly recommended that the batteries be removed from the durometer if it will not be used or will be powered by the AC adapter.

The 9v AC adapter, which provides 9v DC +/- 10% at 30 ma or below, can be used to power the durometer for continuous operation. Connecting the AC adapter disconnects the internal batteries. NOTE: Do not attach the AC adapter when the durometer is already on, as this could result in erroneous readings or an error condition.

Durometer Operation:

To operate the durometer, press the foot of the gauge firmly against the specimen, but not so firmly as to imbed the foot into the surface. This will yield the durometer reading. If during use the display freezes on a number, simply remove the dust cap on top of the indicator and depress the screw with a pen or pencil, the press ON/Clr. This resets the durometer - no further calibration is necessary.

Rex Gauge Guarantee:

All Rex durometers and accessories are guaranteed for a period of one year against defective workmanship and/or material. This guarantee does not apply to products that are mishandled, misused, etched, stamped, or otherwise marked or damaged. The instrument will be repaired or replaced (at the manufacturer's option) without charge by Rex Gauge Company.

Repair and Calibration:

All Rex gauges requiring calibration and/or certification should be sent directly to Rex Gauge Co., Inc., 1250 Busch Parkway, Buffalo Grove, IL 60089, phone 847-465-9009.