Brief Specifications of the ZIP LEVEL ® PRO 2000 DR are: Normal Range High Precision Initial Set-up Vertical Range 12 Metres 600 Metres Initial Set-up Horizontal Range 61 Metres 61 Metres Carry Function Range No limit Range of zero or Mark Settings Full vertical range Level Accuracy 0.1% Record Data Capacity 137 Readings Settings/Data Memory Retention Indefinitely - even without battery Operating Temperature -22 degrees F to + 158 degrees F Shock Resistance Measurement Module 5' drop test onto concrete. Base Unit 3' drop test onto concrete Water Resistance Rain Tight (Not immersible) 9v Alkaline Battery Life 60 hours active use. (Auto shut off after 4 minutes inactive)