Use the Tracking Force Gauge Rega Engineers Use: Atlas Mk2 Performs with Elevated Reliability, Stability, and Accuracy 

No ordinary tracking force gauge, Atlas Mk2 gives you a combination of ease of use, reliability, durability, stability, and accuracy rarely found in such analog devices. Housed in a sturdy aluminum case, Atlas Mk2 features a full-bridge-constructed loadcell and precision-based amplification circuitry that minimizes any need for user input. It compensates for an array of operating temperatures and resists shocks. Even better, the physical layout guarantees your tracking force gets measured in the same place with every use – giving you ultra-fine adjustment all the way down to decimal places. You'll also find a front guard that protects the measuring element and provides easy alignment, further lessening finicky set-up hassle and frustration. Finally, the enhanced Mk2 version offers a much wider weight range to deal with the extreme cartridges (up to 10g).