Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: AC/DC Voltmeter DC Ammeter Ohm Tester Electrical LCD Digital Multimeter DT-830B
Product description: A practical tool for electrician use. It is easy to operate and the readings indicated directly on the screen. It can be use to overhaul all kands of circuit boards. It is also an ideal teaching instrument for students. Digits LCD display with max. reading 1999 Dimension:126x70x24mm, Power: 20mW low power indicator ( 9V Battery is not included ) Overload Protection The Digital Multimeter integrates Voltmeter, Ammeter and ohmmeter which is an ideal instrument for use in fields such as laboratory, workshop, DIYers and home applications. Package includes:DT830B Digital Multimeter+Voltmeter Leads+User manual
Product feature: 3 digits, 7segment,0.5high LCD Display, Max display: 1999, Auto polarity display, Small and compact design,Low cost, pocket size ideal for hobby & DIY users, Sampling 2~3 times readings per second.Diode assembly test / Transistor P-N junction test/Transistor hFE test., Diode assembly test / Transistor P-N junction test/Transistor hFE test.
Product price: $3.76
Product brand: Unknown
Target attributes: Type
Answer: attribute: type
value: voltmeter
source: product description
attribute: type
value: multimeter
source: product title
attribute: type
value: multimeter
source: product description
attribute: type
value: voltmeter
source: product title