Decade Resistance Box By Eisco Labs: A Perfect Replacement For Regular Resistors Product Details This decade resistance substitution box provides 4 decade ranges as given below and total value 0 to 11110 Ohms with a resolution of 1 Ohm. Each decade is selected using rotary switch. All resistance values are of 1% tolerance and with 0.5 watt resistors, 0.5555 watts is the theoretical maximum. At least 2 banana plug cords, alligator clips, a power supply, and at least 1 multi-meter are required for use but are not included. It is important to set the resistance high enough in order to maintain a power output that is less than 2W.Too much current could start a fire or melt part of the box. No safety fuse. Suggested experiments include Ohm's Law: Finding the Relationship Between Current and Voltage (Constant Resistance), Ohm's Law: Finding the Relationship Between Current and Resistance (Constant Voltage) and The Wheatstone Bridge: Determining the Resistance of an Unknown Resistor. Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control. Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. RESISTANCE || Standard four decade resistance box used to calculate resistance - Accommodates most student experiments RANGE || Ranges from 0 - 11,110 Ohms in increments of 1 Ohm - 1% tolerance - Maximum power output of 2W - Lowest Amperage: 20mA - Highest Amperage: 700mA EASY TO USE || Resistances are easily selected by the turn of a dial NOT INCLUDED || At least 2 banana plug cords, alligator clips, a power supply, and at least 1 multi-meter are required for use but are not included SAFE HANDLING || It is important to set the resistance high enough in order to maintain a power output that is less than 2W - Too much current could start a fire or melt part of the box - No safety fuse 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.