The price limit is the maximum price range allowed for a futures contract in each trading session.
First, you need to check the price limits of each instrument here: https://www.cmegroup.com/trading/price-limits.html#metals
If you want to trade, for example, S&P 500 (ESH25) - (current price limit is 7 %), you should not be trading this instrument if the % change during the day exceeds 5% up or down (7% Price Limit minus the 2% product lock limit).