diff --git a/src/main/webapp/WEB-INF/views/web/input/sampleInfo.jsp b/src/main/webapp/WEB-INF/views/web/input/sampleInfo.jsp
index e59bf943..be3837f0 100644
--- a/src/main/webapp/WEB-INF/views/web/input/sampleInfo.jsp
+++ b/src/main/webapp/WEB-INF/views/web/input/sampleInfo.jsp
@@ -711,6 +711,7 @@ function fn_grid_refresh(){
 								fn_isMsg();
 								fn_onLoad();
 								fn_MakeDataArray();
+								fn_ConvertGridData(); 	// DB에서 값없음(-999); 화면에서 갑없음(-); kendo grid에서 값 없음(null) 처리 
 								fn_kendoGrid();
 								fn_setGridCombo();
 
@@ -754,7 +755,20 @@ function fn_grid_refresh(){
 								});
 								/* 탭 & 엔터키 이동 끝 */
 							}
+							/**
+							 * DB에서 값없음(-999); 화면에서 갑없음(-); kendo grid에서 값 없음(null) 처리 
+							 */
+							function fn_ConvertGridData() {
+							    if (!Array.isArray(gridData)) return;
 
+							    gridData.forEach(item => {
+							        if (item.sampleGs == -999) item.sampleGs = null;
+							        if (item.sampleWc == -999) item.sampleWc = null;
+							        if (item.sampleLl == -999) item.sampleLl = null;
+							        if (item.samplePi == -999) item.samplePi = null;
+							        if (item.sampleRd == -999) item.sampleRd = null;
+							    });
+							}
 							function fn_kendoGrid() {
 								var nullTypeString = 'test';
 								
@@ -801,12 +815,12 @@ function fn_grid_refresh(){
 												sampleDepthTo: { type: "number" },
 												sampleSamplingMethod: { type: "string" },
 												sampleShape: { type: "string" },
-												sampleWc: { type: "number", defaultValue: "-"},
-												sampleGs: { type: "number", defaultValue: "-"},
-												sampleLl: { type: "number", defaultValue: "-" },
-												samplePi: { type: "number", defaultValue: "-" },
+												sampleWc: { type: "number", defaultValue: null},
+												sampleGs: { type: "number", defaultValue: null},
+												sampleLl: { type: "number", defaultValue: null },
+												samplePi: { type: "number", defaultValue: null },
 												sampleDesc: { type: "string" },
-												sampleRd: { type: "number", defaultValue: "-" },
+												sampleRd: { type: "number", defaultValue: null },
 												sampleUscs: { type: "string" },
 												sampleCode: { type: "string", editable: false },
 											}
diff --git a/src/main/webapp/kendo-ui/js/common.js b/src/main/webapp/kendo-ui/js/common.js
index fcb53e2e..34962080 100644
--- a/src/main/webapp/kendo-ui/js/common.js
+++ b/src/main/webapp/kendo-ui/js/common.js
@@ -52,8 +52,12 @@ function numericEditor(container, options, isHyphenAllowed = false) {
 
 
 function numericEditor2(container, options, isHyphenAllowed = false) {
-    var input = kendoJQuery('<input type="test" name="' + options.field + '" class="k-textbox" style="width:100%; text-align:right;" />');
-
+    let rawVal = options.model[options.field];
+    if (rawVal === -999) {
+        options.model.set(options.field, null);
+        rawVal = null;
+    }
+    var input = kendoJQuery('<input type="text" name="' + options.field + '" data-bind="value:' + options.field + '" class="k-textbox" style="width:100%; text-align:right;" />');
 	input.appendTo(container)
 	    .val(options.model[options.field])
 
@@ -66,6 +70,12 @@ function numericEditor2(container, options, isHyphenAllowed = false) {
 	            this.value = val.slice(0, -1);
 	        }
 	    })
+		.on("focus", function () {
+		    if (this.value === "") {
+		        this.value = "-";
+		    }
+            this.select(); 
+		})
 
 	    // 2. ↑ ↓ 키로 값 증가/감소
 	    .on("keydown", function (e) {