Popetpop Decade Resistance Box - Adjustable Resistor Substitution Box, 9999 Ohm Product Details Plastic Resistance box is used to measure the unknown resistance. It is used to measure the electromotive and internal resistance of the power . Decade resistance box, made of Plastic material, flexibility and excellent durability, easy to use, for service life. Resistor Substitution Box Size: 14X10X5CM; and durable. The simple resistance box is used as an additional resistance to expand the range of the voltmeter. Resistor box, Used for physical electricity experiment teaching. If you have any questions, please feel free to us, we will reply you within 24 hours. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.