Check the listing for details. Precision Plastic Variable Decade Resistance Resistor Box Teaching Instrument. Condition: New. Listed at 227.76 USD. Precision Plastic Variable Decade Resistance Resistor Box Teaching Instrument Introduction:This rotary resistance box which has low zero resistance ,is used to adjust resistance in DC circuit. This equipment is commonly used in laboratories for schools, factories and scientific research units. The temperature of the air around should be +10℃~+35℃ and the relative humidity 30~80% when it is used .Parameters:Indication Ω Types×100M×10M×1M×100k×10k×1k×100×10×1×0.1×0.01ZX21————0.10.10.5125—ZX21a————0.10.10.10.512—2X21b————0.10.10.10.512—ZX21c—————0.10.10.5125ZX21d———0.50.10.10.512——ZX21e——10.50.10.10.51———ZX21f—210.50.10.10.5 ZX21g5210.50.10.1 Current≤（A）60μ180μ0.6m1.8m6m18m60m180m0.61.53 Adjusting range:ZX21： (0~9）×（0.1~10k）Ω ＝0~99.9999 kΩZX21a:（0~10）×（0.1~10k）Ω ＝0~111.1110 kΩZX21b：（0~9）×（0.1~10k）Ω ＝0~99.9999 kΩZX21c：（0~10）×（0.01~1k）Ω＝0~11.11110 kΩZX21d：（0~10）×（1~100k）Ω ＝0~1.111110MΩZX21e：（0~10）×（10~1M）Ω ＝0~11.11110MΩZX21f：（0~10）×（100~10M）Ω ＝0~111.1110MΩZX21g：（0~10）×（1k~100M）Ω ＝0~1.111110GΩZero resistance: （30±5）mΩThe basic errors are regulated in Table 1.The allowable current of each group resistance are shown in Table 1The dielectric strength between resistance box circuit and shell can withstand 50 Hz frequency,2000V AC, which lasts 1 minute.The insulation resistance between resistance box circuit and shell is not less than 1000MΩThe weight of the resistance box is about 1.3 kg,and its size is 200×150×110mm3.