Add to Cart Quick view RL Drake SWR Calculator Reproduction for W4 Watt Meter Drake MSRP: Now: $5.99 Was: This RL Drake SWR Calculator Reproduction for the W4 Wattmeter, is required to calculate the forward and reflected power measured with the Drake W4 Wattmeter. The W4 meter originally came with a plastic SWR card to insert in the back of the meter. Many... MSRP: Now: $5.99 Was: Add to Cart Quick view Qty in Cart: 0 Quantity: Decrease Quantity: Increase Quantity: Price: MSRP: Now: $5.99 Was: Subtotal: Add to Cart