Frequently Asked Questions
Q:   On some pictures the force gauges have their loading shafts on top and on some on the bottom. Do I need to specify which model I need?
A:   No. All MARK-10 gauges are reversible. The standard configuration is with the shaft up for hand operation. However we will gladly reverse it for you before shipping, if requested.

Q:   Is there an extra charge for a NIST traceable certificate of calibration?
A:   Every MARK-10 instrument includes a standard calibration certificate at no extra charge. Some gauges include a certificate with 10 data points in each measuring direction. For other gauges, data is not included, but is available for an additional charge. Please refer to the Services page for more information.

Q:   Do MARK-10 instruments capture peak readings in both directions?
A:   Yes, the force gauges automatically capture tensile and compressive peak forces, and the torque gauges capture peak torque readings in the clockwise and counterclockwise directions.

Q:   What is the thread size on the loading shafts of MARK-10 force gauges?
A:   Legacy models with capacities up to 200 lbF have #10-32 UNF threads. The 500 lbF units have 5/16-18 UNC threads. For newer gauges, 200 lbF gauges also have 5/16-18 UNC threads.

Q:   What is the housing material of your gauges?
A:   The housing material of MARK-10 gauges is high quality 6061 aluminum.

Q:   Do I need any mounting adapters for installing a MARK-10 gauge on a test stand?
A:   All MARK-10 gauges mount on MARK-10 stands without adapters. We offer mounting adapters for some competitors test stands as well.

Q:   I connected your gauge to a PC, but I can only send data from the gauge to the PC by pressing the DATA button, not by request from the PC. In fact, the gauge does not respond to any command from the PC. What is the problem?

Note: This applies to legacy gauges only - Series BG, CG, EG, CT, CTA, ST, and STA

The problem is the cable. Even though we utilize a "standard" 9-pin connector, you cannot use an off the shelf serial cable from the computer store, since we utilize pins 1 & 2 instead of the customary pins 2 & 3. Either make your own cable or use our P/N 09-1048A (9-pin to 9-pin). Here is the information for wiring:

Gauge pin 1 (DB-9F) >--------------------< PC pin 3 (DB-9F)
Gauge pin 2 (DB-9F) >--------------------< PC pin 2 (DB-9F)
Gauge pin 5 (DB-9F) >--------------------< PC pin 5 (DB-9F)


Q:   My gauge is showing a blank display with four lines across, or it shows the words "OVER". What is the problem?
A:   This is how the gauge says OUCH! The lines indicate an overload condition, most probably because of an overstressed sensor. A most likely remedy is a sensor replacement at the factory.

Q:   My gauge works fine on battery power, but not with the AC adapter plugged in. Why?
A:   A likely reason for this is internal damage due to use of an AC adapter with a incorrect polarity plug. MARK-10 gauges require a plug with the center contact positive (+). Some adapters (e.g. Mitutoyo) use plugs with the center contact negative. The use of such a device even momentarily will damage the circuitry inside the gauge.

Q:   Why is my gauge working fine in one direction, but is indicating overload before reaching its capacity in the opposite direction?
A:   This usually indicates a partial overload where the sensor was overstressed far enough to create a permanent shift in zero balance, but not far enough to break the conductors on the strain gauges. It usually requires a sensor replacement, but some people have been known to bend it back by overstressing it in the opposite direction (NOT RECOMMENDED - Mark-10 is not responsible for possible resulting damage).

Q:   How often should my MARK-10 gauge be calibrated?
A:   We recommend calibration once a year. Heavy use or your company's policy may necessitate more frequent calibrations or checks for accuracy.

Q:   What does "±0.3% FS ±1 count" mean?
A:   This is an accuracy statement indicating that the instrument is accurate to within 0.3% of the full scale with an uncertainty of one count (or least significant digit). In case of a Model M3-100 force gauge the above accuracy statement means that the readings can be off by a maximum of 0.4 lbF anywhere on the scale from 0 to 100 lbF. For this reason it is recommended to choose a gauge with a maximum capacity as close as possible to the measured load.

Q:   What is the recommended operating temperature and humidity range of your instruments?
A:   40F° to 110F° (5C° to 45C°), 96% humidity (non-condensating)

Q:   How long is your warranty?
A:   All Mark-10 products are covered by a best-in-industry three (3) year warranty for materials and workmanship. Please see individual warranty statements for details.

Q:   Can your gauges be connected to a PC or a PLC?
A:   Series 5 force gauges (as well as Series BG and CG legacy gauges) can be controlled externally via Gauge Control Language (ASCII command set). Series 5 can be controlled via USB or RS-232. Refer to the force gauge comparison chart for details.

Q:   How can your gauges be used for COF (Coefficient Of Friction) determination?
A:   The COF between two materials is determined by dragging a block of a known mass over a surface. The force required to do this is divided by the weight of the block. The result is the COF. Using the built-in averaging mode in the BG Series gauges, the average force to move the block may be determined.

1. Prepare a block of first material and attach a string to it.
2. Using the gauge as a hanging weighing scale, determine the weight of the block.
3. Program the gauge to average readings over a desired period of time (e. g. 5 seconds).
4. Using the gauge, slowly drag the block over the surface of the second material until the gauge shows the average force.
5. Divide this reading by the weight to obtain COF.

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