Other Test Instruments

(19,314+ products available)

Find Similar
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test
Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test

Microcomputer Controlled Digital Ring Stiffness Tester with Fast Test VL2 Software for Accurate Pipe Load Characteristic Test

$5,000-5,500
MOQ: 1 set
Zhejiang Yiyu Instrument Equipment Co., Ltd.
verifystar5CN flagCN4.9/5.0(11)
Find Similar
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W
VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W

VLUUKE VK8001 High Accuracy 0.2 IP67 Protection Tan Delta Tester High Voltage Dielectric Loss Measuring Instrument 1 Year 10W

$3,550-3,650
MOQ: 1 set
1 sold
Wuhan Lvnengde Precision Testing Technology Co., Ltd.
verifystar4CN flagCN4.7/5.0(55)
Find Similar
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe
100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe

100kN High Precision Gantry Type Ring Stiffness Testing Machine Electronic Universal Tester for Large Diameter Plastic Pipe

$6,269
MOQ: 1 set
Zhejiang Yiyu Instrument Equipment Co., Ltd.
verifystar5CN flagCN4.9/5.0(11)
Find Similar
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal
Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal

Microcomputer Control Electronic Universal Testing Machine 10kN 200kN WDW Series Servo Tensile Strength Tester for Metal

$4,000-5,500
MOQ: 1 set
Zhejiang Yiyu Instrument Equipment Co., Ltd.
verifystar5CN flagCN4.9/5.0(11)
Find Similar
High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber
High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber
High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber
High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber
High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber

High Low Temperature Test Chamber for Electronic Aging 21 Years Manufacturer CE Certified PID Control Temperature Test Chamber

$9,000-30,000
MOQ: 1 piece
Dongguan Jiete Instruments Co., Ltd.
star1CN flagCN
Find Similar
IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant
IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant
IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant
IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant
IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant

IEC 60068 Standard Climatic Test Chamber Constant Temperature Test Pharmaceutical Stability Testing Chamber ICH Q1A Compliant

$38,000-86,000
MOQ: 1 piece
Dongguan Jiete Instruments Co., Ltd.
star1CN flagCN
Find Similar
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester
Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester

Hot Sale Digital Emulsified Asphalt High Precision Mineral Aggregate Adhesion Testing Equipment Asphalt Aggregate Bonding Tester

$2,000
MOQ: 1 piece
Hebei Jingchuang Instrument Manufacturing Co., Ltd.
star2CN flagCN5.0/5.0(2)
Find Similar
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste
Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste

Digital Capillary Viscometer Thermostatic Bath High Precision Petroleum Products Testing Equipment Kinematic Viscosity Teste

$1,400-1,670
MOQ: 1 piece
Hebei Jingchuang Instrument Manufacturing Co., Ltd.
star2CN flagCN5.0/5.0(2)
Find Similar
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty
Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty

Zbrk Concrete Compression Tester Concrete Testing Equipment 1-Year Warranty

$2,050-2,200
MOQ: 1 piece
Hebei Zhongbo Ruike Instrument Manufacturing Co., Ltd.
verifystar5CN flagCN5.0/5.0(9)
Find Similar
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester
4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester

4AC-D Laboratory Viscometer, Laboratory Paint Viscosity Tester, Viscosity Sample Flow Time Tester

$23-25
MOQ: 5 bags
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester
SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester

SXTJ-6000C Portable Digital Coating Peel Adhesion Tester Tile Bonding Strength Electronic Pull-off Adhesion Tester

$495-500
MOQ: 1 bag
3 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment
Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment

Price of Universal Spring-operated Impact Hammer / Laboratory Testing Equipment

$180-200
MOQ: 1 bag
1 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
hplc column washing pumptrimble alloy gnss receiverrefractive index of copperlaboratory dissolved oxygen sensoranalog dissolved oxygen sensorgnss oem board k500laser alignment tool shaft alignmentgas chromatography nitrogen generator priceyokogawa glass electrode k9142tnheavy metal test kit
Find Similar
Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty
Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty
Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty
Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty
Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty

Stainless Steel Handle Cement Sampling Probe Sampler with 1 Year Warranty

$77.70-83.25
MOQ: 1 box
1 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing
Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing

Soil Particle Size Analysis Set Hydrometer Soil Stirrer Soil Testing Hydrometer Hydrometer test Set of Soil Testing

$300-360
MOQ: 1 set
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment
Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment

Manual CBR Test Machine Cbr Machine CBR Presser with Force-measuring Ring and Dial Gauge for Soil Testing Equipment

$1,060-1,580
MOQ: 1 set
1 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler
Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler

Manual Site Ring Cutting Soil Core Sampler Soil Core Sampler

$12-65
MOQ: 1 set
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
EN Impact Test Table Toy Impact Tester
EN Impact Test Table Toy Impact Tester
EN Impact Test Table Toy Impact Tester
EN Impact Test Table Toy Impact Tester
EN Impact Test Table Toy Impact Tester
EN Impact Test Table Toy Impact Tester

EN Impact Test Table Toy Impact Tester

$150-180
MOQ: 1 set
2 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg
Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg

Soil Modified and Standard Proctor Moulds and Rammers with 2.5kg and 4.5kg

$80-105
MOQ: 1 set
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Soil Hydrometry Areometry Ydrometry Apparatus with Silt Mixer
Soil Hydrometry Areometry Ydrometry Apparatus with Silt Mixer
Soil Hydrometry Areometry Ydrometry Apparatus with Silt Mixer
Soil Hydrometry Areometry Ydrometry Apparatus with Silt Mixer

Soil Hydrometry Areometry Ydrometry Apparatus with Silt Mixer

$300-360
MOQ: 1 set
1 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)
Find Similar
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test
Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test

Digital Concrete Vebe Time Consistometer Fresh Concrete Vebe Consistometer for Slump and Consistency Test

$200-305
MOQ: 1 set
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

Single-slot Stainless Steel Scraper Fineness Tester, Double-slot Fineness Measuring Instrument

$25-110
MOQ: 1 piece
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

Handheld Concrete Strain Gauge and Handheld Deformation Testing Equipment

$150-248
MOQ: 1 piece
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

ASTM D3080, BS 1377 Strain-Control Direct Shear Testing Machine - Soil Shear Strength Testing Machine

$630-785
MOQ: 1 set
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

The Vicat Standard test Apparatus for Cement Consistency Testing Is Used to Measure the Volume Stability.

$32
MOQ: 1 piece
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

Soil Compaction Equipment Soil Consolidation Instrument Soil Consolidation test Device

$430-1,075
MOQ: 1 piece
1 sold
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

Digital Grain Moisture Meter Analyzer 1% Accuracy Sensegood Instruments ODM OBM Customized 1 Year Warranty for Seeds Testing

$55-82.50
MOQ: 1 unit
SENSEGOOD INSTRUMENTS PRIVATE LIMITED
star6IN flagIN4.8/5.0(2)

1000kN Hydraulic Universal Tensile Testing Machine, Servo Material Strength Tester/universal Tensile Testing Machine

$4,000-8,000
MOQ: 1 set
4 sold
Dongguan Xin Bao Instrument Co., Ltd.
star10CN flagCN

2026 New Arrival High Accuracy 5-inch Display Ultrasonic Flaw Detector Non-Destructive Testing Equipment for Pipeline Testing

$899.10-1,169.10
$999-1,29910% off
MOQ: 1 unit
OJIMU TECH (SHENZHEN) CO., LTD.
star1CN flagCN

Wet Dry Friction Color Fastness Tester Manual Crockmeter AATCC 8/165 GESTER GT-D05 0.2% Accuracy IP56 Protection 1 Year

$200-500
MOQ: 1 set
Quanzhou Gester Instruments Co., Ltd.
verifystar13CN flagCN5.0/5.0(2)

ASTM D4944 Soil Speedy Moisture Tester Moisture Content Meter for Soil Testing

$300-350
MOQ: 1 piece
Hebei Zhongke Beigong Testing Instrument Co., Ltd.
verifystar4CN flagCN4.6/5.0(41)

ICC/No. 155&158 High Efficiency Gluten Testing Instrument for Grain Storage Facilities

$3,600-4,800
MOQ: 1 set
Jinan Xinghua Instruments Co., Ltd.
star11CN flagCN

ISO-4649 Horizontal Displacement 4.2mm Rotate Rubber Din Abrasive test Machine

$1,000-2,500
MOQ: 1 set
Guangdong ZME Instrument Scientific CO.,LTD
star15CN flagCN

Computerized Electric Hydraulic Servo Universal Testing Machine 600KN UTM Electronic Tensile Testing Instrument

$6,000-10,000
MOQ: 1 piece
Changsha Langshuo Technology Co., Ltd.
star7CN flagCN4.9/5.0(19)

Optical Projector for Charpy Impact Specimen Gap Check Longitude Latitude Lifting Adjustable Worktable Lab Instrument

$1,500-5,000
MOQ: 1 set
Jinan Liangong Testing Technology Co., Ltd.
verifystar18CN flagCN

Factory Direct Good Quality Digital Hydraulic Universal Testing Machine Steel Bar Tensile Strength Testing Machine Price

$3,500-4,499
MOQ: 1 set
1 sold
Hebei Jinfa Instrument Equipment Co., Ltd.
verifystar2CN flagCN4.9/5.0(16)

Automatic Asphalt Mixture Mixer 20L Capacity Bitumen Mixing Equipment Laboratory Testing Machine

$900-1,100
MOQ: 1 piece
Hebei Jinfa Instrument Equipment Co., Ltd.
verifystar2CN flagCN4.9/5.0(16)

QDB-5A Car Sensor Tester Oscilloscope PWM Drive Multimeter Ignition Injector Simulator Step Motor Driver Diagnostic Tool

$36.90
MOQ: 1 piece
Taian Mingyuan Qi Equipment Llc
star1CN flagCN4.1/5.0(8)

Professional Auto Testing Machine 350mm Detection Height 400mm Belt Width 20KG Load Capacity CE Certified for Various Uses

$2,285.52
$2,56811% off
MOQ: 1 unit
4 sold
Dongguan Yuyang Instrument Co., Ltd.
verifystar7CN flagCN4.9/5.0(14)

GZSX-605B Metal General Lathe Automotive Electrical Skills Training and Assessment Equipment for School Educational Purposes

$5,000
MOQ: 1 set
Guangzhou Sanxiang Teaching Apparatus Co., Ltd.
star1CN flagCN

Stainless Steel Specific Gravity Cup Asphalt Coating Density Tester Manual 1 Year Warranty

$36-45
MOQ: 1 piece
3 sold
Shanghai Shenxian Instrument Co., Ltd.
star14CN flagCN4.3/5.0(14)
dissolved oxygen controller pricechromatography column stainless steelgnss receiver gps rtk controllerchromatography silica gel aluminum platechemical oxygen demand cod analyzermilk antibiotics residues 3 sensoramperometric dissolved oxygen sensorlow cost dissolved oxygen sensortouch screen ro controlleryokogawa bt200 brain terminal