This DURAC® battery hydrometer is used for determining the specific gravity of battery acid. It is supplied with a siphon set which contains a glass tube with plug and rubber suction bulb installed on the upper end and rubber nozzle with clamp for lower end. Rubber parts are made of nitrile, a synthetic rubber that is more chemical resistant and more durable than conventional rubber. The 165mm (6.5in) long hydrometer is individually serialized and features a wax paraffin and steel shot. Includes a multi-language (English, French, German, Italian, Portuguese and Spanish) Statement of Accuracy indicating accuracy traceable to NIST and DKD/PTB. Hydrometer is tested and calibrated in H-B Instrument's exclusive triple accredited/registered ISO/IEC 17025:2005, A2LA accredited laboratory against equipment whose calibration is traceable to NIST and DKD/PTB. Temperature of Standardization 77°F/77°F. Range: 1.150 to 1.300. Divisions: 0.005. Length: 165mm (6.5in). Accuracy: 0.005 Sp. Gr.