Demo calibration, routine operations, easy right😁 Interested to have them for your office or Lab, Purchase it now @$999. 6 months warranty. We are accepting major credit cards, Paypal, Google Pay, Venmo etc 💯 % customers satisfaction‼️ Please msg us Sierra Lab Instrument SLI , rougerhall@gmail.com, 775-433-8538 or ask invoice. Please visit our eBay store, https://www.ebay.com/str/sierralabinstrument?mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5338727021&customid=Ebaystore&toolid=10001&mkevt=1 Ask us for digital coupons, Sierra Lab Instrument SLI , rougerhall@gmail.com, 775-433-8538 Other videos for inventory management, barcode label printing, receipt printing : https://www.youtube.com/watch?v=C_o8MY2OZ_4