Overview: Model: DT-2234 A Digitally measures rotations (revolution per minute / RPM) Digital display gives exact RPM with no guessing or error Carrying pouch included Specification:0.7" LCD reading display Range: 2.5 RPM ~ 99999 RPMResolution/step: 0.1 RPM for range 2.5~999.9 RPM, 1 RPM for 1000 RPM & over Accuracy: /- 0.05% Sampling/averaging time at 60 RPM & up: 0.8 second Measuring distance: 50mm ~ 200mm Powered by 3 x 1.5VAA / UM-3 Weight Approx:136.7g Size Approx:16 x 7 x 3 cm