Analog :
Digi Roller Plus II Measuring Wheel ; Weight – 3 lbs ; Wheel size (circumference) – 39.3/8″; Diameter – 12 9/16 ; Measures up to 999,999.9 Feet / Yards / Meters ; Measuring accuracy – 99.5%

Digital :
Power source – 2 x AA dry cells (non-rechargeable); Battery life continuous operation – 720hrs; Auto shut off – 5 mins; Sensor resolution -11.4mm; Wheel size (circumference) -915mm; Wheel accuracy- 99.4%; Display capacity – (-) 99,999 – 999,999 (6 digits); Recommended speed limit – 20km/h