Specifications:

• Working Humiture: 20%-85%
• Type: 4-digit Counters
• Test Distance: 50mm to 500mm
• Sample Time: 1 second( more than 60 rev/min)
• Revolving Speed Accuracy: ±(0.05%+1)
• Resolution: 1RPM
• Photoelectric Measurement Range: 2 to 99996RPM
• Operating Temperature: 0-50℃ (32-104℉)
• Model Number: BM8234
• Item Weight: 109g/3.85oz
• DIY Supplies: ELECTRICAL
• Display: 5-digit LCD
• Brand Name: SZBJ
• Battery: 9V( 6F22 or equivalent model )(not included)