Maybe one of these similar products would be of interest:-
LCD Display Counter for Rowing Machine with Times and Calories Measurement
Effortlessly Measure Times and Calories with the Rowing Machine Counter
Premium Gym Accessories Measure Times and Burn Calories with LCD Display
Measure Times Calories and Mileage with the Rowing Machine LCD Monitor
Measure Your Old Wheel Bearing Cushion Moving Wheels Measure Your Old Wheel