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Shipping Policy : Battery and Liquid Not Included During the Shipping The surfaces roughness tester is suitable for shop floor use and mobile measure to need of a small handheld instrument, it operation simple, function overall, measure fast, accuracy stability, take convenience. This tester applies to production site and can be used to measure surface roughness of various machinery-processed parts.This tester is capable of evaluating surface textures with a variety of parameters according to various national standards and international standard. The measurement results are displayed digital/graphically on the OLED. Features 14 parameters: Ra、Rq、Rz、Rt、Rp、Rv、R3z、R3y、RzJIS、Rs、Rsk、Rku、Rsm、Rmr Built-in lithium-ion rechargeable battery and control circuit, high capacity, no memory effect; There are remaining charge indicator, charging hint; Tester has charging instructions, the operator can readily understand the level of charge Real-time clock setting and display for easy data recording and storage; Instrument can display a variety of information tips and instructions. For example Measurement result display, the menu prompts and error messages; Technical Specifications Model:YRT200 The maximum driving trip: 17.5mm/0.7inch Indicating error: Not more than ± 10% Variation of indication: Not more than 6% The measured profile: Roughness, waviness, the original contour Parameter: Ra(0.005μm ~ 16μm),Rz(0.02μm ~ 160μm),; Rq, Rx, Rt, Rp, Rv, R3z, R3y, RzJIS, Rsk, Rku, Rsm, Rmr. Filter: RC,PCRC,Gauss,ISO13565 The sampling length L: 0.25mm,0.8mm,2.5mm,8mm Evaluation length L: (1-5)l Internal storage capacity : 100 groups of original data External input / output interface: USB Electric source: Built-in rechargeable lithiumion battery or external power adapter Size:143 x 55 x 42mm (host).Weight: about 0.4KG (host).