Fantastic for measuring epithelial barrier function

I got this voltmeter about 3 years ago, and it still works great. I measure barrier function of human airway epithelial cells cultured at air liquid interface. It gives me reliable data, and it doesn't need to be charged very often. Results were published in J Allergy Clin Immunololgy: Oncostatin M promotes mucosal epithelial barrier dysfunction, and its expression is increased in patients with eosinophilic mucosal disease., Pothoven KL, Norton JE, Hulse KE, Suh LA, Carter RG, Rocci E, Harris KE, Shintani-Smith S, Conley DB, Chandra RK, Liu MC, Kato A, Gonsalves N, Grammer LC 3rd, Peters AT, Kern RC, Bryce PJ, Tan BK, Schleimer RP., J Allergy Clin Immunol. 2015 Apr 1. pii: S0091-6749(15)00188-8. doi: 10.1016/j.jaci.2015.01.043. [Epub ahead of print]