The RPM33 provides both contact and non contact RPM measurements for enhanced versatility. Laser guided non-contact RPM measurements taken up to 500 mm away for added safety. Readings are displayed on the large five digit backlit LCD. Store, recall 10 data sets in memory with 4 parameters (measurement, max, min and average). Comes with contact wheel for linear surface speed measurements, battery, reflective tape, carrying case, and user manual.