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5 Volt alkaline batteries（Battery not included in the package）
Maximum permissible error of Bar diameter:≤±1
The Brinell value can be obtained by referring the attached Conversion Table after measuring the indentations by the readout microscope
the device is used to assess the integrity of concrete pile and identify the extent and location of the pile defect
It has high accuracy press sensor and hardness data is displayed on LED
Smart Sensor AR844 Digital Sound Level Meter Noise Level Meter with Software 30~130dB 31.5HZ~8.5KHZ Hardness Testing Equipment 5 Volt alkaline batteries（Battery notBrand: Graigar Features: AR844 sound level meter can connect with the PC through USB, provides data record downloading, read time data sampling analysis, and printing graph & data function. Auto power off 10 minuteCalendar function Both AC and PWM signal output are available4700 data record function Accuracy up to + 1. 5dBMeasurement range is 30 to 130dB High low speed rate selection Part Number: AR844 Details: Color: White Material: ABS Plastic
