Tachometer, Digital Laser Non-Contact, DT2234C

Simply aim the laser beam at a reflective mark placed on a rotating device, push the button and the RPM reading is immediately displayed. No contact with the shaft or wheel is necessary. Specs: Display 5 digits large LCD; Range: 2.5 - 99,999 RPM; Distance:up to 40 inches; Resolution:0-1000 RPM/0.1RPM; 1,000-9,999 RPM/2.5 RPM; >10,000 RPM (±0.025%+1dgt). Measurement angle:at less than 120 degrees; Range selection: Auto; Laser Output Power:<1mW class II; Sampling Time: 1.0 seconds (over 60 RPM); Memory: Last value, Max Value, Min. Value; Time base: Quartz crystal; Circuit: Exclusive one-chip LSI circuit; Battery: 4 X 1.5V AA (Not included); Case, reflection tape and manual book are included.